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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-14-2014, 07:06 PM   #1
jsdp
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Optimal straight pipe width for header back exhaust?

Anyone have experience running a 2.75" width straight pipe from stock header back?

Anyone know if 2.75 is too wide and may cause power loss/back pressure?

Thanks


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Old 09-14-2014, 07:54 PM   #2
Rob43
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Most of us trying to make optimal HP with a M54B30 use a 3" exhaust tube. I can't remember anyone using a 2.75" exhaust, I'm sure it will work though.


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Old 09-14-2014, 08:18 PM   #3
jsdp
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Originally Posted by Rob43 View Post
Most of us trying to make optimal HP with a M54B30 use a 3" exhaust tube. I can't remember anyone using a 2.75" exhaust, I'm sure it will work though.





Good luck,

Rob43

Isn't 3 inch quite large? A friends NA Silvia lost 15rwkw on the dyno after installing 3" straight pipe to cannon :s

Just a bit worried about losing power; to specify its a Y pipe from the header through a single reso and then a.m muffler. I believe the single pipe is 2.75"

Thanks for the help !


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Old 09-15-2014, 07:04 PM   #4
shm21284
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I use a 2.5" exhaust system with my custom built headers. I have an M52tuB25. See the thread in my signature. I just pulled 192 RWHP on 245,000 miles.
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Old 09-15-2014, 07:11 PM   #5
Llink78
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Im also using a 3" single exhaust back from catless headers.
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