well, i put new headers on and theres a leak where the downpipe and catylitic converter bolt together. it isnt flush so it doesnt seal. any suggestions? heres a pic if you dont know what im talkin bout.

 

nvm, got it fixed.

 

what did u do?

 

ive got the same prob, how can i fix it?

 

well i took it to a shop, they took about 4 inches from behind the cat, welded it to the front of the cat and make sure the seal between downpipe and other pipe was good. if you know how to weld its not hard to do, but it only cost me 20 buxs and bout 15 minutes for them to do.

 

My car has the same problem from when i installed a hiflow cat on my civic, and it leaks air..