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I recently installed a direct fit aftermarket (Magnaflow) catalytic converter/exhaust manifold into my 2004 Honda Civic Hybrid. Immediately the mileage has gone up, but for some reason I can’t seal the flex joint at the exhaust end. I’ve tried adjusting the graphite ring, tightening the bolts, using stronger spring bolts, and coating the joint with permetex exhaust repair sealant.
I can’t get this leak to stop. Any suggestions?
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