TopgunZ

So I have been looking into what to do with my Cat situation on a high horsepower supercharger setup. I hope to make around 14psi some day and have been investigating what this means for cats.

I have read numerous articles which are mostly contradictory and/or non inclusive.

GTM says that you will make more power with stock cats.

Stillen says you will make more PSI with stock cats.

You definitely see more PSI with backpressure but I would rather make more power than psi anyway. I have read where you can make more whp with test pipes vs catted pipes. However, GTM says you will still make more to the wheels with stock cats over anything else.

I have read articles where guys, mostly mustang owners, have went for high HP from centri sc'ers and have clogged their exhaust with the cat guts. But this seems to be happening on cars with 600+whp.

Currently I have Berk HFC's. I prefer cats for the sound and smell. I do have a Fast Intentions cat back with 18" resonators. It sounds good but honestly I liked the sound better with stock cats as I drive into work with this car a lot and a raspy loud car at 6:30am is not very fun and gets old quick. This is why I would not be able to go with straight test pipes. My neighbors would also hate me. But, I would do what is best for my cars safety. I would hate to plug up my exhaust and risk catastrophic failure with a cat that went bad and melted.

I have also heard that stock cats will hold up better in this situation than aftermarket HFC's. So if I will truly make more power and my oem cats will hold up I'd go that route. If I need to I will find some dual resonated test pipes, but would rather not. Not even sure these would offer any benefits over my already resonated FI exhaust with the 18"ers in them.

I plan to run E85 if this matters as I know you get slightly cooler EGT's with it.

Any input would be appreciated.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM