[sameintheend01]

Originally posted by 90gs
ok ive been trying to take my catalytic convertor off for a while but never had anything but a POS socket wrench, so today i went out and bought a breaker bar.

i jacked up the car and took off both front tires so i could access the bolts i needed to take off. i sprayed WD-40 all over the bolts and let it sit for a few minutes then went to work, i snapped off the first bolt with minor effort (cranked on breaker bar and the bolt snapped) and then i realized that i'd need new bolts after putting in the test pipe. so i decided to wait until i got new bolts before i took off the rest of the bolts so right now theres the 3 bolts connecting the cat-back to the cat and 1 bolt connecting the cat to the downpipe (remember 1 bolt is broken) now my car makes a rather large gasping noise when i shut it off. that is air rushing into the header right? is that a bad thing? as long as i dont shut off the car while the revs are dropping i wont crack the head will i?

why do you need need bolts with the test pipe? if you are so worried, just take the cat off for a couple days. i don't think you could crack the head from air pressure left in the exhaust system.