high flow cat

[dj justice]

Are the high flow "race" catalytic converters any good? Also are they smog legal? What kind of horsepower gains can i expect?

[91accord4door]

ebay ones?

[Toddy]

im gonna let you in on a secret. hi flow cats are stock cats that have nothing in them.. just take yours off and gut it.

[91accord4door]

some people dont want to because then they have to buy a new cat for inspection,so its better to buy an aftermarket cat(high flow).that way you can keep your stock cat for emmissions.so that secrets kinda ***.imo.

[PRIMOCB7]

Re: high flow cat

Originally posted by dj justice
Are the high flow "race" catalytic converters any good? Also are they smog legal? What kind of horsepower gains can i expect?

the only true high flow cat available is from random technology. these are smog legal and are available in a range of sizes..plus they bolt right on to your existing exhaust and header, no welding required. ebay 'race' cats...straight pipes, thats all.

[91accord4door]

ya the ebay ones are not high flow but they sound better than stock ones IMO.if they were real they wouldnt be that cheap.thats my lil secret.

[Nycxeracer]

Actually, I have a HI-FLO carsound cat, which is a sub-division of the ever popular Magnaflow. The cat itself is better construction than the OEM one, and sounds much better. Also, it produces on average 5% gains on your overall total HP. They have dyno's to back it up, on top of that TURBO did an article on them, backing up the quality and the gains as well. Random Tech Cats, are not worth the $200.00 IMO.

The ebay cats, or the "hi flo", as ebay calls them are like someone said before, just a straight pipe. There is nothing in it @ all. They are not legal, and might get you in more trouble than the gained HP is worth.

It's your choice though, but myself and many others use Car Sound cats. They are worth the money I believe.

Good Luck.

[mrhonda]

The only brand of high-flow I've had experience with is random Technology. Its hard for me to say exactly how much power I gained from just the cats because I installed the high-flow cats along with the whole exhaust system. However, DO NOT just gut, or remove your old one. If you have emissions testing in your area you WILL NOT pass by a long shot! Also, extremely large fines if you get caught, $2,500 per cat here in Texas.

[DrLove'sKuDang]

actually you can get a catco cat. which is a real cat not that ebay shit. and its carb exempt. and i got mine for half of the randoms cost.

[SecondGenZ28]

Got a question about the gutted cats...Do you lose any backpressure that way? It would seem to me that would cost you some low end torque.

[mrhonda]

Originally posted by SecondGenZ28
Got a question about the gutted cats...Do you lose any backpressure that way? It would seem to me that would cost you some low end torque.

Yes, you will lose backpressure as well as low-end torque. Just stick with OEM or a high-flow.

[Andrew]

The backpressure myth needs to fucking die.

Do a search, we've been over this. It's all about flow velocity.

[cb7-R]

yeahthat backpressure thing is b/s. but what happens when you gut the cat is you interupt the velocity flow of the exhaust gases. sportcompactcar did a good article on this. I believe you can still view it on line.

[Fearit22]

Originally posted by mrhonda
The only brand of high-flow I've had experience with is random Technology. Its hard for me to say exactly how much power I gained from just the cats because I installed the high-flow cats along with the whole exhaust system. However, DO NOT just gut, or remove your old one. If you have emissions testing in your area you WILL NOT pass by a long shot! Also, extremely large fines if you get caught, $2,500 per cat here in Texas.

Is it really that much? I just gave my mechanic an extra $40

[mrhonda]

he he he....well....don't get caught. And about the backpressure thing, I'm telling you from personal experience, you WILL lose torque without a cat.