imported_Slvr-Bullet

..when

1) your cat needs to be replaced?
2) your resonator needs to be replaced?
3) your muffler needs to be replaced?

Looking for actual physical signs

Thanks.

1sykcoupe

i know my cat was clogged and i was puffin alot of black smoke out the exhaust... i got a new hiflow cat and havent had any problems.

imported_t_dot_SiR

and i believe when your muffler has leaking, it will have some ****ty nasty loud annoying sound... you should notice the difference immediately, that's when your exhaust is too rusted, has a hole, or leaking --> need replacement as far as i know

and for cat, when you failed etest haha.... otherwise, i hardly look into it on purpose...

and for resonator, i need to read some other's input too =)

Mr. Death

and for resonator...

Your resonator has gone south when the inside lining comes loose and rattles at certain rpm's.

imported_Team Rukus

you will most likely find out when the noise starts to change on them.

imported_Slvr-Bullet

How can you pinpoint on which one is causing the noise?

bbarbulo

iTrader: (2)

any exhaust component has failed when it has a leak in it. depending on the muffler, some aftermarket ones 'fail' when the fiberglass lining blows out. resonators fail when it rattles or when it has a hole. cats can get clogged or otherwise become inefficient, and only an emissions test, or a check engine light indicating a discrepency btwn the front and rear O2 sensors can tell you that. Otherwise the cat is mounted on the header in the car, so it's more or less a permanent fixture. if you have your stock header still, it may have cracked btwn the # 2 and 3 runners.