In my experience, turn off the rear 02's regardless if you have cats or not as it eliminates any potential problems/SES lights that may arise due to that rear 02.

The cutout was after the cats. Parish demonstrated a 15rwhp gain with a cutout on an otherwise stock LQ4/exhaust I believe.

 

In my experience, turn off the rear 02's regardless if you have cats or not as it eliminates any potential problems/SES lights that may arise due to that rear 02.

The cutout was after the cats. Parish demonstrated a 15rwhp gain with a cutout on an otherwise stock LQ4/exhaust I believe.

 

wow 15 rwhp thats pretty good. thanks for the info

 

so your saying if they are behind the cats...you still throw an O2 code?

 

No. it wont throw any codes. I'm saying just have the tuner turn off the rear 02's regardless as they do nothing and can only cause a ses light to come on. I have high flow cats and the light came on.

 

are the dhm's steel or aluminum?

 

I have the DMH cut out on my 02 Silverado and I've got nothing but compliments. My fiance purchased straight from manufacturer. And you should also know that the cut out as a 4-yr warranty. And I know it's a lot less than $500.

www.dmhperformance.com

Lisa

I found a clip of the DMH, maybe this will help. The truck is cammed.

 

the race ready performance is a lifetime warranty!!!!, but it looks just like the dmh. I would go dmh if I had not got the one I have for 150. tha y should be regular aluminized steel.

 

hey lisa are yours b4 or after the cat?

 

so would cut outs hurt the motor after the headers and b4 the cats?