Cat broken apart

[Frank the Tank]

I have the Borla UEL header and berk muffler delete. the rest of the exhaust is stock. I have a terrible rattle from the front pipe and im 99% sure it is the cat converter. I guess the higher flowing and hotter exhaust from the header has destroyed it. But the car is dyno tuned to these exact mods. If i get a hi flow cat front pipe will i have to retune the car? If so im just gonna get another stock front pipe. Thanks

[steve99]

yep cats been known to disintergrate on cars tracked hard.

hi-flow cat front pipe change wont require re-tune, the aftermarket metalised cats probably tougher than the stock ceramic ones hopefully.

[wparsons]

I would check to make sure nothing is rubbing first (especially a heat shield) before assuming it's the cat.

No re-tune needed for an aftermarket front pipe, and I would suggest getting one if you're replacing it already. The stock one is the 2nd biggest restriction (after the header) in the stock exhaust.

[Frank the Tank]

Thanks guys. thats good to hear. Yea heat shields are completely off the car. wanted to rule that out first.