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exhausts
i have spent a lot of time on exhausts re extractors or headers and have found the best power came from a 4 into 2 into 1 system even up to 9000 rpm they still beat the 4 into 1 hands down and im talking about a proper merge of 4 into 1 and also a tight merge with a expansion chamber as well .done them all and i still go back to my set up of 50 dia mm primarys 800mm long 300 mm secondarys 55mm dia out to 60mm finals then up to 75mm to out the back of the car
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