M5 Guru (>2000 posts)
Join Date: Apr 2007
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RussCan your M5 looks great. Post more pics. The Rad 10 wheels look good.
There is no power loss with the secondary cat delete.
There is also known hp gains from primary cat delete. For this you can do aftermarket headers (Supersprint, Evosport or RDSport). There is also the RPI header design which is the same OEM exhaust manifolds with the primary cats removed and reconnected to the rest of the exhaust system.
The power gains is from the primary cat removal and that's the bottomline.
Good luck with the mods and post more pics of your beautiful M5.
2006 M5 Alpine White/Silverstone : car and project are dead. RIP
2007 GT3RS ORANGE / BLACK
2006 M5 BLACK / BLACK
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