How does adding Akrapovic GT4 and/or Evo "X-Pipe" affect the slip-on sound.

1MORELAP · 01-04-2011, 01:45 PM

I have slip-on installed now. I am considering adding Akrapovic X-Pipe, either the GT4 or the Evolution one. Before I do that I like better understand the expected sound - tone and volume change I should expect.

So far I find the Akrapovic slip-on nice and relatively quiet overall, but just a bit too deep / boomy at low RPMs 1,500 to 2,500 broadly speaking. (Exhaust is BRAND new, I know the sound will change a bit over time and today seemed a bit different already. It has also been FREEZING here. So do not read in too much into the sound comments, but please help me understand what I can expect from adding the front pipes.)

But if I could change the sound, I would like to change the tone to be higher at low RPMs and then louder at 5,000 and above. Do I get there with the full exhaust? GT4 or Evolution?

Tomasz

Bob MG · 01-04-2011, 02:03 PM

Just get the evolution x pipe with HFCs
Unless you SC, catless won't make that much difference compared to louder noise levels

EAS · 01-04-2011, 02:11 PM

Tomasz,

We have the Akrapovic Evolution X-pipe available and that will give you a nice aggressive note when added to your Slip-On. The GT4 X-pipe will make your car aggressive but also very loud, I recommend you listening to one in person if possible, as it may be unbearable for daily driving.

kitw · 01-04-2011, 06:02 PM

If you think the slip on is too loud, changing out your x pipe is not going to help.

Drive the car for a few weeks and let it break in and see if you get used to it. I found the slip on too quiet.

1MORELAP · 01-04-2011, 07:56 PM

Quote:

Originally Posted by kitw

If you think the slip on is too loud, changing out your x pipe is not going to help.

Drive the car for a few weeks and let it break in and see if you get used to it. I found the slip on too quiet.

I do not think it is too loud at all - it is quiet! I just want it a bit higher (less bassy) at low RPMs and would not mind a bit more volume. So if the Evo gives me more of the bassy, hmm, that maybe too much. If it gives me more high pitched - then I want that.

Just drove home. It was pretty good. Low bassiness was gone, and when I floored it - sounded sweet. Maybe we should not be allowed to make comments on exhausts till they are broken in.

Hmm...

BMRLVR · 01-06-2011, 12:55 AM

The Akra Evo is also a bassy system up to say 2500-3000 RPM but it gets higher pitched after that. I have never heard the slip-on in person so I can't comment on the difference between the two.

I'd say to go with the X-pipe, you won't be dissapointed, it has a nice and civilized sound until you get on the throttle. The gains are real nice too!!!! You will definitely feel the additional pull from 3000RPM on up!!!

TheKosherStogie · 01-06-2011, 01:27 AM

I had the evo system. bassy at low rpm

xchosun1x · 01-06-2011, 01:53 AM

i too have the full akra evo system. love the sound

but i do wonder how much louder the catless set up would be also

tom @ eas · 01-06-2011, 11:26 AM

Quote:

Originally Posted by xchosun1x

i too have the full akra evo system. love the sound

but i do wonder how much louder the catless set up would be also

Akrapovic systems with the GT4 X-pipe are a bit on the loud side, but sound menacing on the street.

MRE90M3 · 01-09-2011, 06:54 AM

Gt-4 has a real nice kick to it. My Evo did not sound as aggressive as I wanted it to be ( in my opinion). I'm going to say get the Akra gt-4, sounds great when you want it and loud when you need a live symphony, and harmonies when you are gentle with the throttle.

I must say, after I installed my voltage stabilizer, I have felt increase in torque, smoother ride, lesser drone, and a more tolerated sound coming from the exhaust.

I'll post some videos in my other thread, will post link to my thread here when I get the chance to record.

Omerta · 01-09-2011, 11:18 AM

Quote:

Originally Posted by MRE90M3

I must say, after I installed my voltage stabilizer, I have felt increase in torque, smoother ride, lesser drone, and a more tolerated sound coming from the exhaust.

Ok I will bite.... are are you saying the car has issues keeping the power up? do you have an under-drive pulley?

MRE90M3 · 01-09-2011, 02:46 PM

My voltage is normal, stays around 13.9-14.2
But with the stabilizer I'm at 15.9-16.1. Makes a hell of a difference in my opinion.
I also have the AA pulley and what not.

Omerta · 01-09-2011, 04:00 PM

Quote:

Originally Posted by MRE90M3

My voltage is normal, stays around 13.9-14.2

Sorry to go off topic but out of curiosity, did you measure it before the pulley mod? if so what was it then?

Rydawg1 · 01-09-2011, 04:18 PM

I have happy pants everytime I see and hear this video lol

MRE90M3 · 01-09-2011, 09:24 PM

Good question, never got the chance to do so, well I got the mods really early on when I owned the car ( back in January 08 ).

GOLFFRR · 01-09-2011, 09:37 PM

Quote:

Originally Posted by Rydawg1

I have happy pants everytime I see and hear this video lol

is that just the slip on making those notes? or the full system?

MRE90M3 · 01-10-2011, 02:15 PM

Full system

xchosun1x · 01-11-2011, 04:06 AM

What voltage stabilizer???

Quote:

Originally Posted by MRE90M3

Gt-4 has a real nice kick to it. My Evo did not sound as aggressive as I wanted it to be ( in my opinion). I'm going to say get the Akra gt-4, sounds great when you want it and loud when you need a live symphony, and harmonies when you are gentle with the throttle.

I must say, after I installed my voltage stabilizer, I have felt increase in torque, smoother ride, lesser drone, and a more tolerated sound coming from the exhaust.

I'll post some videos in my other thread, will post link to my thread here when I get the chance to record.

MRE90M3 · 01-11-2011, 01:56 PM

My brother was in Asia shopping parts for his car, he decided to pick Denup voltage stabilizer for my car. Car feels real torquey after the installation. May just be a mind thing though =)

01-04-2011, 01:45 PM	#1
1MORELAP Captain 99 Rep 700 Posts Drives: '22 911 GTS '19 X3, X5, X7 Join Date: May 2010 Location: Seattle, WA iTrader: (0)	How does adding Akrapovic GT4 and/or Evo "X-Pipe" affect the slip-on sound. I have slip-on installed now. I am considering adding Akrapovic X-Pipe, either the GT4 or the Evolution one. Before I do that I like better understand the expected sound - tone and volume change I should expect. So far I find the Akrapovic slip-on nice and relatively quiet overall, but just a bit too deep / boomy at low RPMs 1,500 to 2,500 broadly speaking. (Exhaust is BRAND new, I know the sound will change a bit over time and today seemed a bit different already. It has also been FREEZING here. So do not read in too much into the sound comments, but please help me understand what I can expect from adding the front pipes.) But if I could change the sound, I would like to change the tone to be higher at low RPMs and then louder at 5,000 and above. Do I get there with the full exhaust? GT4 or Evolution? Tomasz __________________ I apologize for spelling mistakes up front, they are a result of multitasking. Last edited by 1MORELAP; 01-04-2011 at 02:13 PM..
	Appreciate 0 Tweet Quote

01-04-2011, 02:03 PM	#2
Bob MG Moderating 418 Rep 2,047 Posts Drives: like a muppet Join Date: Oct 2009 Location: Dubai iTrader: (0)	Just get the evolution x pipe with HFCs Unless you SC, catless won't make that much difference compared to louder noise levels
	Appreciate 0 Quote

01-04-2011, 02:11 PM	#3
EAS BimmerPost Supporting Vendor 548 Rep 5,695 Posts Drives: VF620 M3 Join Date: Mar 2010 Location: Anaheim, CA iTrader: (10)	Tomasz, We have the Akrapovic Evolution X-pipe available and that will give you a nice aggressive note when added to your Slip-On. The GT4 X-pipe will make your car aggressive but also very loud, I recommend you listening to one in person if possible, as it may be unbearable for daily driving.
	Appreciate 0 Quote

01-04-2011, 06:02 PM	#4
kitw Colonel 471 Rep 2,991 Posts Drives: F91 M8, 991.2 GT3 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (20)	If you think the slip on is too loud, changing out your x pipe is not going to help. Drive the car for a few weeks and let it break in and see if you get used to it. I found the slip on too quiet.
	Appreciate 0 Quote

01-06-2011, 12:55 AM	#6
BMRLVR Grease Monkey 295 Rep 2,646 Posts Drives: 2011 E90 M3,1994 Euro E36 M3/4 Join Date: Apr 2006 Location: Fort McMurray, Alberta, Canada iTrader: (3)	The Akra Evo is also a bassy system up to say 2500-3000 RPM but it gets higher pitched after that. I have never heard the slip-on in person so I can't comment on the difference between the two. I'd say to go with the X-pipe, you won't be dissapointed, it has a nice and civilized sound until you get on the throttle. The gains are real nice too!!!! You will definitely feel the additional pull from 3000RPM on up!!! __________________ 2011 E90 M3 ZCP - Individual Moonstone/Individual Amarone Extended/Individual Piano Black With Inlay:LINK!!! 1994 Euro E36 M3 Sedan - Daytona Violet/Mulberry:LINK!!!
	Appreciate 0 Quote

01-06-2011, 01:27 AM	#7
TheKosherStogie Lieutenant Colonel 342 Rep 1,805 Posts Drives: 08 M3 DCT AW/Red Join Date: May 2009 Location: West Hollywood iTrader: (1)	I had the evo system. bassy at low rpm __________________ 17' M2 DCT - KW CS - Re71r - Carbotech BW C13 - 1:57:2 ACS - 1:49:6 WSIR - 1:30:6
	Appreciate 0 Quote

01-06-2011, 01:53 AM	#8
xchosun1x Track Duty 266 Rep 2,467 Posts Drives: Track build 08 E92 M3 DCT Join Date: Nov 2009 Location: Los Angeles iTrader: (14)	i too have the full akra evo system. love the sound but i do wonder how much louder the catless set up would be also
	Appreciate 0 Quote

01-09-2011, 06:54 AM	#10
MRE90M3 "its baby blue m3 to you sir." 26 Rep 447 Posts Drives: Silverstone Metallic II Join Date: Jul 2009 Location: Upland California iTrader: (2)	Gt-4 has a real nice kick to it. My Evo did not sound as aggressive as I wanted it to be ( in my opinion). I'm going to say get the Akra gt-4, sounds great when you want it and loud when you need a live symphony, and harmonies when you are gentle with the throttle. I must say, after I installed my voltage stabilizer, I have felt increase in torque, smoother ride, lesser drone, and a more tolerated sound coming from the exhaust. I'll post some videos in my other thread, will post link to my thread here when I get the chance to record.
	Appreciate 0 Quote

01-09-2011, 02:46 PM	#12
MRE90M3 "its baby blue m3 to you sir." 26 Rep 447 Posts Drives: Silverstone Metallic II Join Date: Jul 2009 Location: Upland California iTrader: (2)	My voltage is normal, stays around 13.9-14.2 But with the stabilizer I'm at 15.9-16.1. Makes a hell of a difference in my opinion. I also have the AA pulley and what not.
	Appreciate 0 Quote

01-09-2011, 04:18 PM	#14
Rydawg1 Private First Class 7 Rep 156 Posts Drives: 08 E92 M3 Join Date: Nov 2009 Location: Fort Worth, Texas iTrader: (1)	I have happy pants everytime I see and hear this video lol __________________ 08 M3 E92 DCT Silverstone Metallic II /Blk/alum trim Megan Racing exhaust mods to come...
	Appreciate 0 Quote

01-09-2011, 09:24 PM	#15
MRE90M3 "its baby blue m3 to you sir." 26 Rep 447 Posts Drives: Silverstone Metallic II Join Date: Jul 2009 Location: Upland California iTrader: (2)	Good question, never got the chance to do so, well I got the mods really early on when I owned the car ( back in January 08 ).
	Appreciate 0 Quote

01-10-2011, 02:15 PM	#17
MRE90M3 "its baby blue m3 to you sir." 26 Rep 447 Posts Drives: Silverstone Metallic II Join Date: Jul 2009 Location: Upland California iTrader: (2)	Full system
	Appreciate 0 Quote

01-11-2011, 01:56 PM	#19
MRE90M3 "its baby blue m3 to you sir." 26 Rep 447 Posts Drives: Silverstone Metallic II Join Date: Jul 2009 Location: Upland California iTrader: (2)	My brother was in Asia shopping parts for his car, he decided to pick Denup voltage stabilizer for my car. Car feels real torquey after the installation. May just be a mind thing though =)
	Appreciate 0 Quote