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i used to do r&d for magnaflow what diameter is the core on the resonator and muffler also you can build a diffuser or the outlet to the muffler it will not hurt flow to much and will quiet it down alot.

i recently purchaced a 93 civic with a b18 c1 and am having problems the idle wants to stay around 1500 to 2000 when warm and on inicial start up around 2800 i cleaned the iac and lowered the tming now it idles around 1200. i can't find a vacum leak any where any help please it has a skunk two...