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      04-05-2017, 07:25 PM   #1
askforcharliek
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mod questions

looking for some ideas. i have a 16 340ix msport with auto trans in a lease. i've intalled a bms intake and jb4. looking for more exhaust growl and not sure if a downpipe or a cat back exhaust would best (not really looking for more power just more bark). also considering getting a set of progressive springs. is it ok to swap out just the springs? will the shocks handle the lowered ride height over the long haul (another 27 months at least?). thanks in advance.
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      04-06-2017, 12:13 AM   #2
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One thing to consider is cost. The downpipe is going to run you ~$450 and the catback, around $2k. In addition to sound, I believe the downpipe will also net more hp than the catback (someone please correct me if I'm wrong), especially since you have a tune.

After typing this post, I'm kinda regretting going AWE catback instead of just the downpipe with a res delete.
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      04-06-2017, 07:41 AM   #3
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If you want more exhaust sound, get a mid-pipe... I'm thinking of eventually getting one for my car with the stock exhaust. There are some videos around of 340i with mid-pipe only. Cat-back isn't really worth the cost IMO.

Since you have a JB4, I've read a down pipe will help with performance a bit. Not sure if it'll be too much louder with a stock exhaust but you might hear more of the turbo.

Decide based on what you want.
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      04-06-2017, 09:28 AM   #4
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Quote:
Originally Posted by DrifterX View Post
If you want more exhaust sound, get a mid-pipe... I'm thinking of eventually getting one for my car with the stock exhaust. There are some videos around of 340i with mid-pipe only. Cat-back isn't really worth the cost IMO.

Since you have a JB4, I've read a down pipe will help with performance a bit. Not sure if it'll be too much louder with a stock exhaust but you might hear more of the turbo.

Decide based on what you want.
Really depends, DP with stock exhaust sounds....like the muffler is hollow or something.

DP with catback sounds ridiculously good.

I compared with a buddy who has stock exhaust and DP, and myself DP+catback and the sound was very different, it basically sounded like a different car.

Also, normally aftermarket catbacks weigh less, and are easier to remove if you need to replace anything. They're normally clamped on, while OEM exhaust is all in one piece.

Most people won't bother with a full exhaust system, but if you sat in one vs OEM, you'd probably want one.
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      04-06-2017, 02:36 PM   #5
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Do the DP and see how it sounds. If you like it, then its a two-fer
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      04-06-2017, 04:05 PM   #6
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$2k is expensive for a catback but it is worth it if you want sound over power! My advice would be to wait for a sale from one of the vendors so that you can save a couple hundred bucks. I personally went with the AWE Tuning exhaust and it's the perfect amount of loudness for a daily driver.

I haven't put downpipes on my car as of yet so I couldn't tell you how much louder the sound increase is but in videos they sound slightly louder than stock and burble a bit louder. Videos don't represent sound that well though haha. Catless downpipes also smell, I don't mind it but many people do.

Another option is to have a shop cut/fab your exhaust. Will be cheaper than catback and depending on what you do, also cheaper than downpipes.

As for suspension, from what I've been told, coilovers are the way to go.
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      04-06-2017, 04:53 PM   #7
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Quote:
Originally Posted by askforcharliek View Post
looking for some ideas. i have a 16 340ix msport with auto trans in a lease. i've intalled a bms intake and jb4. looking for more exhaust growl and not sure if a downpipe or a cat back exhaust would best (not really looking for more power just more bark). also considering getting a set of progressive springs. is it ok to swap out just the springs? will the shocks handle the lowered ride height over the long haul (another 27 months at least?). thanks in advance.
Exhaust will always sound better than downpipe, that being said DP are much cheaper, gives you power increase and sounds really good.

If you are not after power and only care about sound, exhaust is the way to go ... If you want both get downpipe


I would start with downpipe and then decide if it is worth it to add an exhaust
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      04-06-2017, 07:10 PM   #8
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Quote:
Originally Posted by wassy4 View Post
$2k is expensive for a catback but it is worth it if you want sound over power! My advice would be to wait for a sale from one of the vendors so that you can save a couple hundred bucks. I personally went with the AWE Tuning exhaust and it's the perfect amount of loudness for a daily driver.

I haven't put downpipes on my car as of yet so I couldn't tell you how much louder the sound increase is but in videos they sound slightly louder than stock and burble a bit louder. Videos don't represent sound that well though haha. Catless downpipes also smell, I don't mind it but many people do.

Another option is to have a shop cut/fab your exhaust. Will be cheaper than catback and depending on what you do, also cheaper than downpipes.

As for suspension, from what I've been told, coilovers are the way to go.
+1 on the AWE. Still kinda thinking downpipe + res delete might've been the cheaper + better option.

I'm also holding off on a downpipe for now. I'll probably go with a catted one so I don't get flagged by those emissions sniffers on the side of the highway.
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      04-06-2017, 07:13 PM   #9
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Quote:
Originally Posted by G.Newt View Post
Quote:
Originally Posted by wassy4 View Post
$2k is expensive for a catback but it is worth it if you want sound over power! My advice would be to wait for a sale from one of the vendors so that you can save a couple hundred bucks. I personally went with the AWE Tuning exhaust and it's the perfect amount of loudness for a daily driver.

I haven't put downpipes on my car as of yet so I couldn't tell you how much louder the sound increase is but in videos they sound slightly louder than stock and burble a bit louder. Videos don't represent sound that well though haha. Catless downpipes also smell, I don't mind it but many people do.

Another option is to have a shop cut/fab your exhaust. Will be cheaper than catback and depending on what you do, also cheaper than downpipes.

As for suspension, from what I've been told, coilovers are the way to go.
+1 on the AWE. Still kinda thinking downpipe + res delete might've been the cheaper + better option.

I'm also holding off on a downpipe for now. I'll probably go with a catted one so I don't get flagged by those emissions sniffers on the side of the highway.
I'd like the extra power and sound from catless downpipes but I don't want to risk ruining the exhaust note.
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      04-25-2017, 02:30 PM   #10
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Quote:
Originally Posted by wassy4 View Post
I'd like the extra power and sound from catless downpipes but I don't want to risk ruining the exhaust note.
Catless will make the exhaust deeper and more exotic sounding.. Slightly louder but the biggest change is the deeper tone.

I think catless with stock exhaust sounds awesome...

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      04-25-2017, 06:12 PM   #11
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I'm pretty much in the same boat as you. Leased a '16 340i xDrive back in November and I wanna change up the exhaust especially for the upcoming summer months. I can't justify the $1500+ for an axleback or $2000+ for a catback.

I'm saving up for a DP (and JB4 to clear the code) but I think a resonator delete on top of that will sound pretty good. Only thing I am worried about is NY inspections but I think the added performance and sound of the DP is worth it. Is there any videos of a stock exhaust with only a catless DP and a resonator delete?
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      04-25-2017, 10:39 PM   #12
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Quote:
Originally Posted by NYC_340i View Post
I'm pretty much in the same boat as you. Leased a '16 340i xDrive back in November and I wanna change up the exhaust especially for the upcoming summer months. I can't justify the $1500+ for an axleback or $2000+ for a catback.

I'm saving up for a DP (and JB4 to clear the code) but I think a resonator delete on top of that will sound pretty good. Only thing I am worried about is NY inspections but I think the added performance and sound of the DP is worth it. Is there any videos of a stock exhaust with only a catless DP and a resonator delete?
I think for myself 1500-2000 for a catback is worth it, I've heard stock with DP and it really doesn't compare. The sound is more aggressive and unique with the catback, and if you don't want to do downpipe for emission purpose, the catback will still increase sound by 50% and freeflow, downpipe increase sound by another 50%.
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      04-25-2017, 10:39 PM   #13
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Quote:
Originally Posted by NYC_340i View Post
I'm pretty much in the same boat as you. Leased a '16 340i xDrive back in November and I wanna change up the exhaust especially for the upcoming summer months. I can't justify the $1500+ for an axleback or $2000+ for a catback.

I'm saving up for a DP (and JB4 to clear the code) but I think a resonator delete on top of that will sound pretty good. Only thing I am worried about is NY inspections but I think the added performance and sound of the DP is worth it. Is there any videos of a stock exhaust with only a catless DP and a resonator delete?
I'm not familiar with NY laws, but most states don't require emissions testing for the first several years. Then it's followed by a period of OBD-II testing only, and finally after more years is where they do actual sniffer emissions testing. Since you're leasing, just keep the stock downpipe and swap back in when it's time to turn in. I wouldn't worry unless you plan on keeping the car afterwards.
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      04-25-2017, 10:57 PM   #14
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Quote:
Originally Posted by chaungo View Post
I think for myself 1500-2000 for a catback is worth it, I've heard stock with DP and it really doesn't compare. The sound is more aggressive and unique with the catback, and if you don't want to do downpipe for emission purpose, the catback will still increase sound by 50% and freeflow, downpipe increase sound by another 50%.
Don't get me wrong. I've saw videos on Youtube with the AWE exhaust and it sounds glorious. But to think I can get a intake,jb4,dp, and resonator delete for around $1300 seems like a lot more stuff over just a catback. Thanks for the feedback though I will definitely need to pull the trigger on one at some point haha.

Also I am a little confused on the stock exhaust layout. So it goes from the cat in the DP to a resonator then a second cat to the muffler correct? In which case an AWE mid pipe would pretty much remove the resonator and the second cat?
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      04-25-2017, 11:09 PM   #15
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Quote:
Originally Posted by NYC_340i View Post
Don't get me wrong. I've saw videos on Youtube with the AWE exhaust and it sounds glorious. But to think I can get a intake,jb4,dp, and resonator delete for around $1300 seems like a lot more stuff over just a catback. Thanks for the feedback though I will definitely need to pull the trigger on one at some point haha.

Also I am a little confused on the stock exhaust layout. So it goes from the cat in the DP to a resonator then a second cat to the muffler correct? In which case an AWE mid pipe would pretty much remove the resonator and the second cat?
This is correct. My AWE midpipe removed the secondary cats + resonators.
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      04-26-2017, 07:44 AM   #16
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Quote:
Originally Posted by NYC_340i View Post
Don't get me wrong. I've saw videos on Youtube with the AWE exhaust and it sounds glorious. But to think I can get a intake,jb4,dp, and resonator delete for around $1300 seems like a lot more stuff over just a catback. Thanks for the feedback though I will definitely need to pull the trigger on one at some point haha.

Also I am a little confused on the stock exhaust layout. So it goes from the cat in the DP to a resonator then a second cat to the muffler correct? In which case an AWE mid pipe would pretty much remove the resonator and the second cat?
Quote:
Originally Posted by G.Newt View Post
This is correct. My AWE midpipe removed the secondary cats + resonators.
Not sure the 340i has two cats, I believe it's cat-resonator-resonator.
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      04-26-2017, 08:12 AM   #17
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Quote:
Originally Posted by toybm View Post
Not sure the 340i has two cats, I believe it's cat-resonator-resonator.
Right. Cat only in the DP, followed by 2 resonators on the mid.
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      04-26-2017, 09:14 AM   #18
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Quote:
Originally Posted by toybm View Post
Not sure the 340i has two cats, I believe it's cat-resonator-resonator.
Yea the cat in the downpipe is huge I think resonators in the midpipe
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      04-26-2017, 01:41 PM   #19
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Right. Cat only in the DP, followed by 2 resonators on the mid.
+1

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      04-26-2017, 06:27 PM   #20
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The dp does not change your stock exhaust note. It just sounds louder (a little raspy sometimes). I have dp and midpipe with stock exhaust. I'm looking at the Akrapovic Evolution exhaust. Has anyone heard of this exhaust?
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      04-26-2017, 06:31 PM   #21
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Dp sound weird on the stock cat back. Midpipe with dp sounds like crap.... too tingy with the stock axle back. Spend the money and get a quality setup.
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      04-26-2017, 07:51 PM   #22
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So would you guys recommend a catless DP with everything else stock or a mid pipe with everything else stock? I know the DP is going to be better performance wise but how about sound?
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