Anybody notice a perf. increase removing their cat

[85_305]

Just curious to know if it helped to either remove or put on hi-flow cats?

[ForcedFirebird]

If you go with high flow cats, it's just as good if not better than no cats.

[85_305]

Really? how so
I mean, all pollution facts aside.. how is it better than going catless?

[Joseph Upson]

Really? how so
I mean, all pollution facts aside.. how is it better than going catless?

You remain legal and have the benefit of near free flowing exhaust. I believe you also tend to lose some bottom end power without the catalytic converter, not just hearsay but I think I saw a dyno run to prove it. May also have a bit to do with the engine being tuned as a system.

[85_305]

You remain legal and have the benefit of near free flowing exhaust. I believe you also tend to lose some bottom end power without the catalytic converter, not just hearsay but I think I saw a dyno run to prove it. May also have a bit to do with the engine being tuned as a system.

Well I would deffinently keep the cats for the pollution concerns.. but man the LAST thing this 3.1 needs is even LESS bottom-end power LOL. This thing harps up top, but not down low.

Have you experienced how going w/ hi-flow cats helped your car?

[ForcedFirebird]

No, but Hot Rod magazine did a full feature about it probably about 10yrs ago. Can't remember the issue #, but mufflers/hfcats actually INCREASED performance in the 1/4.

[85_305]

Hmm.. this is good to the ears. I am gonna pick me a cat up