2012ls3vette

Im going to buy longtube headers and Im wanting to know everyones opinion or people to chime in. Should I go catless or keep the cats?? Thanks guys

Boomer111

You asked so I say go with the cats. They are on for a good reason. Against Federal law not to run them, plus the car will smell without the cats.

Power loss is minimal.

CaryBob

Eliminating the cats doesn't buy you any horsepower to speak of, it just makes your exhaust very loud and makes everything around you smell like gasoline. Plus it's illegal everywhere, environmentally irresponsible, and just downright tacky. And someday you or a future owner might want to live in one of the 20 or so states that require emissions testing to register a car.

berk4422

Key words: "environmentally irresponsible" no other answer matters.

TLS_Addict

Carbon footprint? Clown shoe, here buddy. lol

If its tuned correctly it doesnt smell like gas. Thats for people who dont tune their car worth a damn.

2012ls3vette

So is the smell bad when your driving with the windows up?? And can you smell it sitting at a stop light?

berk4422

Not if it's tuned right.

LMB-Z

put the cats on...ask your tuner. I put longtubes on the 05 I had. Tuner advised me no hp gain for not having them plus the gas smell. After all was said and done, I had a pretty good hp gain after the header install and the tune. Plus the good sound. I don't think you will regret installing the cats.

Don-Vette

Get high flow cats to go with the headers. This is all you need for only $1440 with FREE shipping!!!

http://marylandspeed.com/slp-long-tu...27-p-3881.html




SLP's 2009-12 C6 LS3 Corvette/Grand Sport Long-Tube Header Package features 1-3/4" main primary tubes flowing into two 2.5" high flow venturi collectors. The headers are mandrel bent 409 stainless steel and ceramic coated to keep heat in, exhaust velocity up, and under-hood temperatures down, while the rest of the system is made from high-quality 304 stainless steel.

Also, included in the package is a pair of 3" high flow catalyst converters, which flows into a full 2.5" integrated PowerFlo-X®Crossover assembly. They're fully compatible with all stock emissions-control equipment and use OEM flanges for a perfect fit and proper bolt retention.All necessary installation instructions and hardware are included, backed by our Lifetime Warranty.

SLP C6 Corvette/Grand Sport Long Tube Header Package features:

Features 1-3/4" equal-length primaries.

All mandrel bent stainless steel construction to maximize flow.

Polished aluminum-ceramic thermal-barrier coating (interior and exterior surfaces) to keep heat in, exhaust velocity up, and under-hood temperatures down.

Reduce ¼-mile ET's by up to 4 tenths of a second and increase trap speeds by as much as 4 mph.

Complete bolt-on installation, bolts directly to factory exhaust system, (no welding required).

Compatible with all factory emissions-equipment.

Are covered by our Performance Guarantee and Lifetime Warranty.

rcallen484

Why are you thinking you might want to go without them?

raspyc6

Put the cat's on to be sure if it is a street car. TLS is correct to a degree that exhaust will reek less of gas the leaner the tune. That said, the car will be louder in a not better way...and trust me my car is f'ing loud. Also, the are so MANY ways to make a cat and the design dictates how much of the hydrocarbon residual is oxidized. I have LG long tubes and NPP exhaust, of course with cats, and it seems like the further out I go on the clock the more my exhaust stinks. I hear this is the inherent nature of cats to sorta burn up and lose their efficacy over time. If I am wrong then another member can provide more light but I have watched a few people spit the cat's out the rear end while watching them run from a 20 roll.

2012ls3vette

hmmm so no hp is gained from no cats? I have npp exhaust to...

Joe B.

[QUOTE=Don-Vette;1582737321]Get high flow cats to go with the headers. This is all you need for only $1440 with FREE shipping!!!

http://marylandspeed.com/slp-long-tu...27-p-3881.html

The disclaimer at the end of this ad states that it is not emissions legal, for those who care.
I never had a problem with fuel smell on my (ecm) tuned catless exhaust on my '91.
The '12's have 4 cats and could have fitment issues with aftermarket exhaust. Anyone have first hand experience with this?
http://www.corvettenewsblog.com/2012...ic-converters/

berk4422

I say - go with a Cat


Gained 30 HP!!!

2012ls3vette

hmmm