while we are here, Anyone have feedback on GESi Cat's? Iv'e been considering moving from a "rally" cat to one of these.

https://vibrantperformance.com/catal...Path=1527_1326


Never mind, looks like they are all discontinued

 

Below are the results on my GTR using a 3.5" 100cpi high flow cat (XForce CAT12-350(100) - $89 from Summit Racing). This is with the 4" dump valve open before the CAT and then with it closed so exhaust has to run through the CAT and out the back of the car. I gain torque upon the initial boost hit by not going through the CAT with the 4" dump valve open, but on the topend it was less than a 10hp difference. Same CAT I run on my EVO making 601@wheels on Shell 93 pump gas.

 

Here are some tests I did over ten years ago:

https://www.evolutionm.net/forums/ev...trate-cat.html

https://www.evolutionm.net/forums/ev...-flow-cat.html

 

Hmmmm .... Man 11 years went by that quick??? I still have that cat...LOL