do high flow cats actually work???
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,176
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From: highland village texas
do high flow cats actually work???
considering high flow cats (random tech or SLPs?) but first want to know if they really do help...do they increase HP??? thanks.
Le Mans Master
Joined: Nov 1999
Posts: 7,695
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From: Imperial Beach CA
Re: do high flow cats actually work??? (C5 CU)
Witnessed two dyno runs with cars without cats completely. The one just had the cats removed along with an intake but the numbers came out the same as cars with just the intake. The other one had just installed long tube headers and there was only an 8 rwhp increase. Conclustion not worth it.
Team Owner
Joined: Jun 2000
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From: Just trying to make it through each day.
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St. Jude Donor '03-'04
Re: do high flow cats actually work??? (C5 CU)
It's all relative IMO. I had gutted stock CATS and could not stand the smell of fuel and fumes.................it was sickening. I installed the Random Tech HF cats and it COMPLETELY fixed that problem. It was worth every penny for me.
My car still made 477rwhp/544rwtq. That's with a 436ci stroker.
My car still made 477rwhp/544rwtq. That's with a 436ci stroker.
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,176
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From: highland village texas
Re: do high flow cats actually work??? (C5 CU)
inspection not a sniffer in texas for cars newer than 1997 (?)....just want to know if i will pick-up any hp and sound difference...thanks.
Le Mans Master
Joined: Oct 2000
Posts: 6,504
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From: Sausalito CA
Re: do high flow cats actually work??? (C5 CU)
Sound yes...more bass.
Perhaps more"popping/gurgling" on deacceraltion.
HP...unknown, but I'll add my car seems to rev up faster with the hi-flows.
Carsounds (magnaflow's brand) are the bang for the buck. Their is a chart some where and $300 difference to the Random-tech brand.
Also be aware of fit issues, the c5 tunnel is small.
Perhaps more"popping/gurgling" on deacceraltion.
HP...unknown, but I'll add my car seems to rev up faster with the hi-flows.
Carsounds (magnaflow's brand) are the bang for the buck. Their is a chart some where and $300 difference to the Random-tech brand.
Also be aware of fit issues, the c5 tunnel is small.
Team Owner
Joined: Feb 2003
Posts: 37,329
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From: Plano Texas
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13
Re: do high flow cats actually work??? (C5 CU)
C5 CU,
Take a run over to LGM (in Wyle, Texas). They can provide information (stats) on their long & short header systems for you to review.
I replaced my B&B's with thier "long's" - have run with and without cats (as of now staying without). ODB II testing in the major cities of Texas, so car passes inspection without any issues.
Sound difference is much more to my liking (have Corsa Indy exhaust, and X pipe).
Take a run over to LGM (in Wyle, Texas). They can provide information (stats) on their long & short header systems for you to review.
I replaced my B&B's with thier "long's" - have run with and without cats (as of now staying without). ODB II testing in the major cities of Texas, so car passes inspection without any issues.
Sound difference is much more to my liking (have Corsa Indy exhaust, and X pipe).
