THIS QUESTION GOES OUT TO ALL YOU GURUS:

I got a exhaust (second hand 3inch mandrel from japan off a sti), 6 speed gearbox, dca rotors and brembos installed to my car and everything was fine at normal ride height on my 04 wrx.

After lowering it with coilovers - there was a rattling sound (to me it sounds like exhaust is hitting something) when i go over small bumps or bump roads

then i got it back raised to normal height (with standard suspension) cause i thought the ratteling was from the coilovers. noise gone.

Then i installed koni shocks and kings ultra low springs and the rattlings back! enough to drive a person crazy

I was just wondering if lowering the car is cause the exhaust to hit the diff or something like that. (if so can anyone reccomend a good exhaust shop) or is it something else im not thinking of?

any help would be great

Cheers

Chris