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I have 97 civic b20b swapped. my original exhaust exploded. needed coolant. So im gonna replace the whole thing. I have a Weapon-R Headers for 2.5" to 3.0" exhaust. Inlet size for those are 2.5". The collector gasket measures about 2.73. My current exhaust main piping size is 2.5" /w 2.25" inlet size. What are some afforable exhaust systems with the proper size piping? What is the right size piping anyway?? PLZ HELP
 

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sizing pipes means:
big pipes and no mods to the engine . you loose low end power.
a lot of mods and to small an exhaust pipes and the engine will choke and won't perform right.

and a freebie
no such thing as backpressure being good for a 4 stroke I.C.E
but you will hear some people debating that.
 
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