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      03-23-2016, 06:31 PM   #1
MCFilmWerks
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OEM x pipe/exhaust diameter| Tuning question

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Hey guys, so I dropped off my car to get a custom x pipe made, from searching around online everything I found pointed to the exhaust being 2.5 inches in diameter. Some other threads said 2.5, the borla x pipe says 2.5, and i believe it was the active autowerke said 2.5.

Well the guy called me and said that the piping is 2.75, so now I have to wait until next week for it, but I just feel like the 2.5 inch would work.

So my question is, is the oem x pipe 2.5 or 2.75 inches?

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Separate of this, since I'm going catless, and also since I just put my wheels on so the speedo is reading wrong. Is there a handheld tuner or something along those lines that lets you change parameters and what not?

When I had my mustang I had a tuner and my dyno tunes were loaded on it, but I could also go in and change stuff like that on the actual tuner. I'm pretty new to the M's so I wasn't sure if there was something similar to this for m3's

Thanks in advance everyone!

Last edited by MCFilmWerks; 03-24-2016 at 07:02 AM.
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      03-24-2016, 02:39 AM   #2
bosspower
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I did 2,25 from headers till muffler .
perfectly happy with power and sound .

Is enough i think if staying NA.
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      03-24-2016, 02:44 AM   #3
American Dave
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My custom test pipes and x pipe are 2.5" running to my Borla exhaust. Unless you are going to SC the car then that size is what you want trust me.
http://m3world.com.au/product/stainl...no-resonators/
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Borla Atak Exhaust/ M3 World X Pipe and Test Pipes/ aFe Pro Stage 2 Intake / 19" Advan DZ-DF Forged Wheels wrapped in ContiSport Contact 5P 245/35/19 Fronts & 285/30/19 Rears/ KW Var 3 Coilovers / BPM Sports Stage 2 Tuned/ VAC Rod Bearing & Bolt Replacement / Throttle Body Actuator Gear Set Replacement

Last edited by American Dave; 03-24-2016 at 02:52 AM.
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      03-28-2016, 11:39 AM   #4
MCFilmWerks
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yeah i neded up with the 2.5 and it sounds good, thank you guys!
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