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      12-10-2010, 03:03 AM   #1
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M3 Akrapovic GT4 exhaust tune help!!!!

Okay so I got the gt4 exhaust, after three months, I'm finally driving the car, exhaust sounds real good, except drone and random drops, and sticky rpm's. I've got a ESS tune fir the RPi straight mid section and AA exhaust.. Really need a tune with the gt4 setup. any tuners out there whose worked on the GT4 yet?
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      12-10-2010, 07:32 AM   #2
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Huh?
You think you need a "special" tune for your exhaust??


Give Jeremy @ oetuning a call ... ur best bet is a live dynotune.
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      12-10-2010, 11:30 AM   #3
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The Akrapovic evolution is somewhat unique, because it has cats but they are further downstream. So, it needs a different tune than most exhausts. The GT4, without cats, should be just like any other catless exhaust in terms of flow.

If you haven't been driving the car, just drive it for awhile, the DME is pretty smart and will figure things out in a few hundred miles. When I put my Akrapovic Evolution on, I had a really soggy bottom end and the car was cranky in the midrange, just some part throttle drive cycles and a few WOT runs cleared things right up.
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      12-10-2010, 11:54 AM   #4
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Hey guys thanks for the inputs, what I'm struggling with is more like the car has different acceleration fell every time u start the car. It doesn't feel smooth or the same. Weird.. Unexplainable. Any thoughts?
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      12-10-2010, 11:55 AM   #5
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Btw, when I had the akrapovic evolution, I didn't have this problem with my current tune at the time, only when I went with the gt4..
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      12-10-2010, 12:17 PM   #6
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^ how many miles are on the new exhaust?
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      12-10-2010, 12:32 PM   #7
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currently, about 1.5K?
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      12-13-2010, 11:57 PM   #8
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Anyone else here to chime in? Which Dyno tune?
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      12-14-2010, 01:50 AM   #9
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I just installed the Akra GT4 catless mid-pipe last week. Of course I have the ESS S/C and tune, but so far no issues.

The car sounds like a frikken monster and LOVE IT!


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      05-02-2012, 02:36 AM   #10
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Quote:
Originally Posted by biglare View Post
I just installed the Akra GT4 catless mid-pipe last week. Of course I have the ESS S/C and tune, but so far no issues.

The car sounds like a frikken monster and LOVE IT!


How much louder is the gt4 then the evo system?
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      05-31-2012, 04:43 AM   #11
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Its VERY loud compared to EVO, Best Exhaust ever. i went through about 4 sets of exhaust, and definitely loved the GT4 the most.
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      05-31-2012, 09:03 AM   #12
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Quote:
Originally Posted by leigh View Post
How much louder is the gt4 then the evo system?
Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
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      05-31-2012, 09:06 AM   #13
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Quote:
Originally Posted by biglare View Post
Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
i need that x pipe!!!!!!!!!!!!!!!
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      05-31-2012, 09:17 AM   #14
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Quote:
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Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
I heard this in person at MFEST its INSANE!! sounds soooo good.
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      05-31-2012, 09:40 AM   #15
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Biglare, I think you should post up a vid
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      05-31-2012, 11:53 AM   #16
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Quote:
Originally Posted by SehrSchnell View Post
I wonder how the GT4 x-pipe compares to the Dinan x-pipe in terms of being loud... both have no cats.
Yeah but the Dinan is quad resonated where the GT4 is straight piped. I can say after running a catless/resonator less RPI exhaust its TOO loud! The GT4 is made of Ti so its gonna sound a little different and it has an H Pipe to help deal with the rasp. The resonators really help with the sound.
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      06-03-2012, 02:17 AM   #17
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Quote:
Originally Posted by biglare View Post
Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
lol i get mine in 2-3weeks
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      06-03-2012, 02:20 AM   #18
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Quote:
Originally Posted by MRE90M3 View Post
Its VERY loud compared to EVO, Best Exhaust ever. i went through about 4 sets of exhaust, and definitely loved the GT4 the most.
is it a lot louder when ur just driving around normal?
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      06-03-2012, 02:23 AM   #19
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Quote:
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Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
could you please put video up
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      06-03-2012, 10:27 AM   #20
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There seems to be a huge discrepancy into what sounds good. Perhaps it's an age thing as suggested. Perhaps it's me, as I have been down the heavily modified road with other cars and I'm 38 now. That being said, I like some aggressive sound and think ideally an adjustable exhaust would be the best compromise but who has that money. Doesn't anyone have kids and mortgage among the many other expenses. Anyway, I find straight exhaust to be everything this car is not. Refinement is what BMWs are all about, for me at least. Bottom line is get what you like. I can't decide, as any drone is unacceptable and so is 3k for an exhaust. Thinking out loud
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      06-07-2012, 01:44 AM   #21
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Quote:
Originally Posted by SehrSchnell
I wonder how the GT4 x-pipe compares to the Dinan x-pipe in terms of being loud... both have no cats.
I've had both and the GT4 midpipe much louder and more of a raw racecar sound.
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      06-07-2012, 01:47 AM   #22
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Quote:
Originally Posted by leigh
Quote:
Originally Posted by biglare View Post
Just as MRE90M3 stated it is much louder than the Evo system, much louder. You will wake the neighbors with the cold start alone! I Love It!
could you please put video up
I'll get a video up soon. I'm going to the track this weekend so I'll have plenty of vids.
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