E90 build

Vitamin-J · 06-06-2012, 03:11 AM

Hello all, I'm new to the forum and basically looking for some information.

I have an N54 E90 that was recently in a little fender bender, while the car is out of commission I'm going to go ahead and put some extras on it but I'd like a little input.

My goal is power but I don't want a ton of noise.

On the list of things getting done

1. Injen dual cone intake
2. Cobb access port
3 HorsePowerFreaks intercooler

from here I need a little input.

I was at HPF today and took a look at the cat back system they've developed for the E90 and it sounds amazing, what I don't know is where am I gonna get the best gains as well as good sound.

I've come to the conclusion that for noise sake I really cant do both exhaust and downpipes, from my understanding that makes the car very very loud.

So, from experience are the best power gains in the downpipes, or the exhaust? As a side note the HPF exhaust system does reduce the weight of the car by 45lbs so even if the downpipes give me a larger gain how much are we talking and is it worth is over the weight loss as well?

I'm also playing with the idea of meth injection, but honestly, I know very very little about it so any first hand input on meth would be great as well.

Also if there is anything major I'm missing or if there is arguably better product out there feel free to let me know.

Thanks

-VJ

E90Company · 06-06-2012, 07:40 AM

Well I would get a DCI over the injen intake, the gains are similar if not better with the DCI, plus its cheaper and easier to remove. As far as the exhaust mods, on the N54 you don't gain much at all with an exhaust system, the gains are with a downpipe. So if I were you I would get a downpipe (VRSF), DCI, COBB, and then the HPF IC. You will be full bolt on, the exhaust will be slightly louder but better sounding, and your car will fly. Also throw some e85 gas in every once and awhile

Vitamin-J · 06-06-2012, 11:22 PM

whats the gain difference between doing downpipes vs the catback?

I think I'm settled on the injen intake unless there is a solid reason I should go with the buger dci, I've had good luck with injen in the passed, I like the way they look better, I don't like that the DCI airfilters rest against the motor, the BMS DCI looks like you pulled off the airbox and hose clamped filters on th exsisting pipes....which I think is what you do lol

Curt2000 · 06-06-2012, 11:31 PM

25-30HP for DPs, possibly more with the supporting mods you are planning on having. Catback...10-15HP max.

Vitamin-J · 06-08-2012, 09:16 AM

whats the noise difference between the downpipes and the exhaust?

I'm totally about the power gains but I really don't want the car to be too loud.

which is noisier, down pipes or cat back?

remember the exhaust is also saving me 40lbs so although I'm not getting as much power, weight is just as good as HP.

06-06-2012, 03:11 AM	#1
Vitamin-J Registered 0 Rep 3 Posts Drives: E90 Join Date: Jun 2012 Location: Portland Oregon iTrader: (0)	E90 build Hello all, I'm new to the forum and basically looking for some information. I have an N54 E90 that was recently in a little fender bender, while the car is out of commission I'm going to go ahead and put some extras on it but I'd like a little input. My goal is power but I don't want a ton of noise. On the list of things getting done 1. Injen dual cone intake 2. Cobb access port 3 HorsePowerFreaks intercooler from here I need a little input. I was at HPF today and took a look at the cat back system they've developed for the E90 and it sounds amazing, what I don't know is where am I gonna get the best gains as well as good sound. I've come to the conclusion that for noise sake I really cant do both exhaust and downpipes, from my understanding that makes the car very very loud. So, from experience are the best power gains in the downpipes, or the exhaust? As a side note the HPF exhaust system does reduce the weight of the car by 45lbs so even if the downpipes give me a larger gain how much are we talking and is it worth is over the weight loss as well? I'm also playing with the idea of meth injection, but honestly, I know very very little about it so any first hand input on meth would be great as well. Also if there is anything major I'm missing or if there is arguably better product out there feel free to let me know. Thanks -VJ
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06-06-2012, 07:40 AM	#2
E90Company Major General 195 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	Well I would get a DCI over the injen intake, the gains are similar if not better with the DCI, plus its cheaper and easier to remove. As far as the exhaust mods, on the N54 you don't gain much at all with an exhaust system, the gains are with a downpipe. So if I were you I would get a downpipe (VRSF), DCI, COBB, and then the HPF IC. You will be full bolt on, the exhaust will be slightly louder but better sounding, and your car will fly. Also throw some e85 gas in every once and awhile
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06-06-2012, 11:22 PM	#3
Vitamin-J Registered 0 Rep 3 Posts Drives: E90 Join Date: Jun 2012 Location: Portland Oregon iTrader: (0)	whats the gain difference between doing downpipes vs the catback? I think I'm settled on the injen intake unless there is a solid reason I should go with the buger dci, I've had good luck with injen in the passed, I like the way they look better, I don't like that the DCI airfilters rest against the motor, the BMS DCI looks like you pulled off the airbox and hose clamped filters on th exsisting pipes....which I think is what you do lol
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06-06-2012, 11:31 PM	#4
Curt2000 Brigadier General 1013 Rep 3,157 Posts Drives: '93 Supra Turbo Join Date: Jun 2007 Location: Washington D.C. iTrader: (25)	25-30HP for DPs, possibly more with the supporting mods you are planning on having. Catback...10-15HP max. __________________ Former Car: '16 SUNBURST GOLD F80 ///M3--6MT/Carbon Cloth (ED Thread) Former Car:'13 SANTORINI BLUE E92///M3--6MT/Speed Cloth/ZCP(ED Thread) INSTAGRAM:@C2KMotorsports
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06-08-2012, 09:16 AM	#5
Vitamin-J Registered 0 Rep 3 Posts Drives: E90 Join Date: Jun 2012 Location: Portland Oregon iTrader: (0)	whats the noise difference between the downpipes and the exhaust? I'm totally about the power gains but I really don't want the car to be too loud. which is noisier, down pipes or cat back? remember the exhaust is also saving me 40lbs so although I'm not getting as much power, weight is just as good as HP.
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