Well I'm going to have a custom ypipe done for my long tube pacesetter headers. But I was going to have the muffler shop incorporate my stock dual cats in the custom ypipe to keep legal for inspections. But if they are going to do it should I have them gut out the cats if they are willing? Would the car run better with keeping the cats or having it gutted?

 

You could gut out the cats yourself too if u wanted...

But i have an ORP and its amazing. I'll never put back that stock cat except when i have to take my test.