Cats hurt or help

[Holeshot540]

Hey guys,
I was wondering if you take off your cats does this help or hurt over all performance? IF it does why is this?
Hunter

 

[cobrayankee]

Hey guys,
I was wondering if you take off your cats does this help or hurt over all performance? IF it does why is this?
Hunter

There's been a few posts about this, and I believe the outcome was basically that your sound is awesome, but you actually lose some low end torque.

 

[BlkLightningTX]

Probably drop torque because you're dropping backpressure.

You'll also throw a code and confuse the o2 sensors, which could lead to even weirder stuff.

Buy highflows, call it good.

Besides, tampering with exhaust equipment is a federal offense. Removing those cats could land you in club fed! :Y hehe

 

[Lightninforce]

Cats off

If you where to take the cats off I offer a Mil-eliminator that will prevent the code and check light.

 

[Holeshot540]

Thanks. See I ws just wondering because I have a Chevy truck with a Big Block and I know that with the cats off it helped and it also sounds real awesome. I will probablly go with the high flo cats though. Does running it open header mess the computer up at all. Has anyone tried this at the track or on the dyno?
Hunter

 

[BlkLightningTX]

These engines are designed to have a certain degree of backpressure. Running them open-header isn't the best idea, and quite likely wouldn't even get you the best performance. And yes, it would create much havoc with the computer because so many variables would be outside "optimal" ranges, not to mention your O2 sensors would be freaking out.

I'd say high flow cats, but if you want to go all out put headers and o2 sims and just pipe it out to the tips (no cats, no mufflers). You'll at least maintain a little bit of backpressure then (more than you would with open headers anyways) and it'll be 10x quieter hehe. But even with exhaust -cats -mufflers you'd probably still need to reprogram the computer.

 

[StrikesTwice]

Open headers on a daily driver will burn your valves
(from what I've heard)

 

[Holeshot540]

I would have only run open header on the track or at the dyno. Not every day.
Hunter