I have had this loud squeak for a while now coming from the rear. The first dealer said it was the Lca's whish is what i thought so they replaced the lca's and that made it all worse. Well i drove down to ohio to see my gf so i took it to the dealer there, well this guy says its my after market exhaust. He said the mechanic tightend every suspension componet down and all was quiet but once the whole car warmed up the sound came back. One of the mechanics apperantly put his hand on the exhaust and it stopped... funny thing is the sound is only made when going over bumps even really small ones but not when its stopped. so has anyone had this happen with thier aftermarket exhaust? its a high pitch squeak and it happens often and its damn annoying. if so how do i fix it? thanks for the help guys

also if its the exhaust, how would having the lca's replaced make it so much worse??