i installed sportlines on my ls last night and this morning i went to drive it for the first time and bad news for me. at the slightest bump the rear clunks pretty loud. something is wrong back there and i dont know what it is. i took it to les schwab and they said it wasnt a clearance issue nor anything wrong with wheels or tires. they said its prolly my springs. sounds like metal to metal clunking. what could it be?

 

probly loose rear shock bolts, you have to tighten the crap out of them. if you're using a socket use a cheater bar, if an air gun turn the pressure up all the way. when i installed my koni's i had the same sound, very heavy metal on metal, i got like 1/2 turn out of the right rear and the noise went away.

 

just found out what it was.. had to the wheel off to see and push down on the car. when i got my exhaust done they ran the pipe too low for lowering the car.. so when i hit a bump the thing that holds the bottom of the spring hits the exhaust pipe.