Never threw check engine lights with my fast intentions resonated test pipes. I've help a friend do the install on his and it was such a pain in the ***, 5 hours with a blow torch and saws all, that I paid someone to put mine on. Our cars make an odd hiss sound during deceleration from 3000-2000 rpm. It's not bad and it's unavoidable if you change out the stock cars. The power increase is wonderful. With the resonated test pipes drone won't be too bad. Now with non resonated it gets annoying.
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