9th September 2007, 04:07
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#8
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M5 Guru (>2000 posts)
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I have the SS headers without their cats ( too much ) and I am satisfied with the product. The claim of 40 to 50 hp I highly question unless it's crank hp. It sure it's to the wheels!! My car dyno'ed stock 408 rwhp and after the SSheaders, Evosport pulley, Evosport 3.91 diff and the AA ECU stage 2 upgrade the car dyno'ed 460rwhp. Total of 52 rwhp after the mods. Therefore 40 to 50 hp from headers alone is bogus. I've since added the Gruppe M intakes and the Dinan throttle bodies and after re-dyno'ing the car I made a wooping ZERO hp !!! Still at 460 rwhp. The car runs strong I must admit, the so called " butt dyno ". Good luck to you and you may consider the Evosport headers. I know those who have and are happy and they are good guys over at Evosport.
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2006 M5 Alpine White/Silverstone : car and project are dead. RIP
2007 GT3RS ORANGE / BLACK
2006 M5 BLACK / BLACK
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