Quote:
Originally Posted by nospam
What are the benefits of quad tip/pipe? On S2000 (another I4 engine) turbo setups a single pipe produces the best performance but drones at resonant frequencies. Dual pipe setups are tuned to mitigate this drone. Is there a benefit to quad in the N20 or is it purely cosmetic? The 1 series M coupe is only dual pipe correct? Is there a benefit to quad on the other M vehicles (more cylinders)?
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I looked up the stock exhaust setups on RealOEM.com:
The E9x 335i is dual muffler.
The 135i is single pipe, single muffler, dual tips.
F3x 328i is single pipe, single muffler, dual tips.
The F3x 335i is single pipe, single muffler, dual tips.
The 1-series M Coupe is single pipe, single muffler, quad tips.
All other M vehicles appear to be dual muffler, quad tips. The E9x M3 performance exhaust:
The S2000 is dual muffler.
I guess there is no such thing as quad muffler. I'm assuming the tips are purely cosmetic.