KnightIRD

Hey guys. Some of you know, I have a rattling rear cat which is not a heat shield. I want to just cut the Downstream cats and leave the upstreams. Is this feasible? I don't have inspections around here, just wondering what you all recommend. Also, will it throw a Check Engine Code? If so, what do I need to install to rid it, I hate it when that thing's on.

Carcrazygts2

You should be able to just cut them out and weld in pipe in there place. As far as oxygen sensors go you will either need a programmer where you can turn rear oxygen sensors off or you can try the Gott's oxygen sensor mod using 2 spark plug non foulers for each oxygen sensors.

KnightIRD

Okay, sounds great!! I hear that it is a pain to weld a pipe in place of the downstream cat, would it be possible just to use some flex exhaust tubing? Like this?

Or is this a bad idea?

Carcrazygts2

Flex is a bad idea.

blupupher

iTrader: (2)

Flex pipe is a temporary fix.

KnightIRD

Okay, sounds good guys, thanks!! Also, sooner or later I'm going with true dual exhaust with 12 inch glasspacks

Carcrazygts2

just make sure to have some sort of crossover. Either a H or X-pipe

KnightIRD

Why do you say that? I'm not contradicting, I'm just wondering. I'm not very educated about exhaust yet.

ScrewThat

To get the best performance out of the exhaust. H pipe equalizes pressure on both banks while an x pipe does the same thing while still providing the smoothest flow possible, producing the most performance out of the two.

KnightIRD

So, just go with the x-pipe then??