This is weird because a friend of mine has the same setup and its sound is solid. Replace all your gaskets. If you used the gaskets that came with it, replace them with gaskets from autozone or napa then use "exhuast joint and crack sealant. This should work. make sure that you when you put the gasket in that you use the sealant with it...put sealan on the inside of flange, put gasket on, put sealant on the other pipe connecting to the flange and bolt. another thing is i would highly recommend using grade "A" nuts and bolts on exhaust or any system that will get hot and use antisieze on the nuts and bolts. While your under there, make sure all the flanges are welded good. If this dosent work then its the HFC and ask to get them replaced. Good luck
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