Ok, so my Dynomax Super turbo catback exhaust is ordered and will be coming in around next week. I would like to replace my cat converter, adn I was wondering if I should go stock, or get a hi flo cat converter. Any suggestions?

 

my high flow cat cost me $94 at summit racing part number WLK-15735

 

Was there any noticeable performance improvement with the hi flo cat? Or was it just louder?

 

its coming in the mail tuesday so i dont know yet

 

There are three different things I have done to this car in years past (and recent) that have show the most noticible improvement in engine performance and revving above 4000rpms.

1) was a highflow cat (A good quality one- watch what you buy, not all that claim "highflow" are equal) I run a Gibson SS unit (no longer availible. I will go to Random Tech SS next. The rear muffler and exhaust showed no improvement until I got rid of the stock cat.

2) was the install of a power pulley on the crank (ASP underdrive pulley)

3) was the Carbonfiber driveshaft- The car craves high rpm it revs so damn smoothly up to 5800 rpms and probably higher but I won't let it because there is no reason to toast the motor senselessly. Power stops at about 5200- I have rarely taken it past that. (edit: The driveshaft, just like most other things I have done so far, where put on there not to aid what I have now- but were put there first to handle what I intend to add afterwards. I built these things first so sh*t doesn't break when I add the power on a higher rpm range)

 

The way GM made the cats in the 80's was restrictive; the way GM makes them now is pretty good- almost turns them into "high flow" from the factory!

But- a new GM cat is about $300. Aftermarket performance ones are about $100.

Anything will probably flow better than your aging stock cat. Once our catalytic convertors get old enough, the pellet bed breaks up and can clog the exhaust.