Thread: A closer look at the N55 (a tear down)
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      08-27-2010, 09:27 PM   #34
D.B.S
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Drives: '11 X5 35i / '13 S5
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Quote:
Originally Posted by Doug007 View Post
Can you say 4" single exhaust?
The N55 X5 is already running a 3" pipe, so I can see 4" as a possible exhaust option on any N55 engine... Just not sure if it will be a positive mod or negative mod... Exhaust experts could chime in on this...
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