Originally Posted by ///Mantis
i havent agreed with u in a long time coz u were too busy praising MDCT(
), i guess it's time i agree with you like 100%. 20 hp my ass!
Go talk to the guys on M5board.com.
M5 RDsport headers are a +38hp gain. http://www.racingdynamics.com/Locali..._E60_Motor.htm
RPI claims +28whp and +31wtq with their headers, with dynos to prove.
Supersprint headers on average have seen a +30hp gain.
Not sure what Evosport claims with their M5 headers.