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I have the pro speed racing uel header (basically an unbranded Tomei) and stainless overpipe and this has bothered me since the day I installed them. When I had my catback installed they assured me there was no leaks, another shop also confirmed it.
Unfortunately it appears its just a side-effect of having thin-wall stainless steel exhaust headers. For me, though, It does lessen the hotter the engine is. It's worst on cold starts.
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