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Originally Posted by CanadianM3 I am definintely considering Eisenmann Race Exhaust but I am not sure if I want to do catless or catted, and x-pipe or h-flow. What's better for a NA engine? |
For performance I'm sure X pipe will be better because the flow crosses each other smoothly and also creates a higher pitch exhaust sound. H-pipe might be a little bit louder because more flow is going straight than some flow making a 90 degree turn to connect. Also H pipe will sound deeper.
I would personally go X pipe if I were you lol, I think that higher pitch note is more suitable for BMW. The sound level difference is very little, and X pipe will help accelerate smoother and a bit of performance gain.