Exhaust getting really loud after 4000rpm and losing power

[92_Talon_Auto]

i have a 90 tsi awd with a 20g and all supporting mods. when i get on the gas the car gets about 4000rpms my exhuast gets really loud and makes a ratteling noise and the car starts to lose a little power. it seems like im reving the car up to about 7 or 8 grand. i just had the water pump, and timing belt changed. plz help me if you can.

thx alot nick

 

[eclpsegsx12]

balance shafts are out of phase....take it back to the people who did it and have them redo it.....or do it yourself, its easy.

 

[fastwaytech]

Yep. Actually, oil pump sprocket not set right (with or without balance shafts) will do it as well.

That's what ths issue was with mine, which has no BS.