Well i finally had my cats cut off this afternoon. i have stock exhaust manifolds with the stock Y into a flowmaster dumped. I also have a cutout.


it is more raspy especially before shifts. it is noticeable louder. any performance gains, i think so. they weren't clogged but both were cracked on the inside and the guy doing the work said it wouldn't be long before they gave me trouble.

anyway, i can now lay waste to the rubber from a dead stop through second gear. from a 25 punch i spin and the *** end gets sideways a little. also the top end feels like it pulls much better. i can't wait till i get some headers and test it with the cutout open.

i do have the rear o2 sensors deleted and i run 4.10 gear with a 31" tire.

 

Im killing mine soon
good to hear you got good results

 

Sounds like some good results.

 

Hey goshawk23, what engine does your truck have? Im thinking of doing the same to my RC/SB 4.8L Sierra.

 

i have the 5.3L.

the only thing that that is killing me about the getting the cats cut off is the fact that my poor man cutout has a broke gasket and it is more noticible now. before i coudln't here the leakage but now with the air just rushing by it is more profound. but that is an easy fix. i just need to buy some new gaskets.

if i can make it to the track sunday i will be able to see how it does on the bottom end. as of now, i think i might have gained some low end grunt.

 

Im getting my truck's cats off soon too. I have hp tuning so Ill just need an update. Hope I dont lose too much low end. BTW, I heard that the truck gets about one full point richer ill have to check on that.