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      07-17-2012, 05:57 PM   #8
beta
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Drives: 2006 M Roadster
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Quote:
Originally Posted by nobrakese28 View Post
I use to work in Aerospace composites, I can say that piece is a beauty. Extremely tricky geometry. 4200 is pretty expensive, but that would be a wicked option. What are the gains (hp,tq)?
I imagine it's pretty close to CSL numbers, which is probably another 15hp over headers. There's a dyno video here, he got 306 HP.

From what I hear you do this mostly for the glorious induction noise. $ per HP you're much much better off doing forced induction. This is only for the purists that want to keep it NA.

Imran: Make sure you post on the Z4-forum which is the UK version. I'm really hoping you guys go through with this
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