installed greddy evo...noise under car

[algunn2004]

hi all,
I just replaced my TRD muffler and piping with a Greddy Evo. When I am accelerating I notice a resonatiing sound coming from under the passenger seat. The sound goes away after I hit about 40 mph. Anybody have a similar problem? I have already checked all the bolts and gaskets.
619 TRD Solara.

[Mole]

did you check to see if you have an exhaust leak?

there's a trick w/ all evolution exhausts. when you're tightening the bolts on the tail end, make sure you prop up both sides of the pipes, ensuring a 100% seal.

if you still have that funky exhaust leak, then check the rest of the pipping for a hole.