Once the pipe is down, ask them to let you look in it. The cat substrate looks like the screen on house window, though the holes are several inches deep. Most cats have two separate stacks like so:
If the front stack is damaged, it'll stay put until the back stack goes, hence you need to look at both sides of the cat (inlet/exit). I've seen the substrate melt on one half (looks like stretched taffy) and remain intact on other, and sometimes it'll break free, etc.
Several things to be aware of:
1. Your engine oil is probably heavily contaminated. Should change it after the new cat.
2. If the guy you bought it from replaced the cat once before, that suggests something isn't right. A full tune-up (plugs, wires, filters, etc. and maybe look into the ignition coil as it might have a weak output) is a must and be sure to do the timing belt. Any codes that eventually appear, be SURE to investigate, as they might point to the neglected issue if a tune up doesn't solve it.
3. IF the cat(s) substrate broke out, it'll either end up in the muffler or possibly get lodged in the actual exhaust pipe somewhere. This can actually cause excessive back pressure and again, down on power.
4. Universal cats are OK. Just be sure to use the correct one meant for the engine.
5. TAKE YOUR OLD CAT WITH YOU!!! IF IT'S STILL IN ONE PIECE, A JUNK YARD WILL GIVE YOU CASH FOR IT. A METAL CORE YARD WILL GIVE YOU MORE.
Edited by Bushwick, 06 December 2017 - 05:45 PM.