Quote:
Originally Posted by Celica RA45
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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my mechanic said he would have gone for something like that to improved the torque of the motor.. i told him that the motor spends its life above 5000rpm. he question that and told what i have will give me top-end only!! when you say hands down gain... how much are you talking about... 1 or 20 hp..??