Exhaust size..2.5 into 2.25..is it really that bad?

LatinEM2

La Raza #2
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#1
What do you guys think of this: getting a Profab header..and a carsound high flow cat welded into my Tanabe Hyper medallion.. they thing is that the tanabe is 60 mm..2.25 and the profab and cat will be 2.5 in.
Will i even benefit from that Profab header? i have a Comptech non-race one now..i do plan on adding cam's later on the road..(6-8) montsh or so..
 




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