cat converter

[bigkahuna2187]

does hollowing or removing the catalytic converter really make a diffence in performance?

[Fixer]

from what we see on the tibs...no

[04 elantra cvvt]

I know that it does on domestics, but from my experience in the import market, it does not.

[O_GT]

getting rid of it maybe but hollowing it out will mess the flow and you may lose hp

[watson80]

just buy a hi flow cat

[Dust]

punch the cat with a straight pipe through it if you are going to hollow it out

[DAILLESTWUN]

just buy a hi flow cat


How exactly does it work? What is the difference if u get a hi flow or just hollow out the stock cat???

[slvrsleeper]

Hollowing out the stock catalytic converter basically removes the restriction in airflow imposed by the catalyst which may free up about 2 hp. Unfortuneately it also screws up the emissions system on your car and can cause all sorts of other problems. A high flow cat will give you the horsepower gains without the sacrifices Watson80 is right.

[DAILLESTWUN]

Hollowing out the stock catalytic converter basically removes the restriction in airflow imposed by the catalyst which may free up about 2 hp. Unfortuneately it also screws up the emissions system on your car and can cause all sorts of other problems. A high flow cat will give you the horsepower gains without the sacrifices Watson80 is right.

Thanks a lot

[watson80]

we will never lead you wrong bro!!

[kylemorg]

Anyone have any makes/part numbers of high-flow cat converters that will bolt up to the stock header / exhaust?

I know that replacing the manifold and cat-back exhaust as well will yield the best performance, but I don't have the $$ to do it all at once. I'm already installing the Kore cat-back exhaust, and I may change the manifold later.

[04 elantra cvvt]

How exactly does it work? What is the difference if u get a hi flow or just hollow out the stock cat???
The high-flow cats just use one block of honey-comb instead of two. This still gives the all-important back-pressure, but allows it to breathe a little better.