rocky321

08 GT 172,000 miles. Original cats. Want to replace with quality high flow cats. However, I don't want to replace any of the stock exhaust, just from the manifolds to the mid H pipe. Are there catted connection pipes for this app? I see them for the 10-13 model years.

Ricardo

Just get a catted X/H pipe. They're not expensive. By the time you get two high flow cats and have them spliced in you're at the cost of buying an x/h pipe and doing it yourself.

edit: Nevermind, looks like prices went up and seems to be hard to find any catted h pipes. Most exhaust shops will not remove cats from a car or they face a huge fine per Federal law . If you find one that will, just get some SLP cats and have them spliced in.

SpartaPerformance

Why would you want to replace them? Factory cats are pretty high flow and if yours are still working why bother.

danzcool

At 172K miles, the cats probably are pretty used up, so I think his thoughts are that if he's going to replace them anyway, why not go to high flow...

have no suggestions other than find some weld-in ones and have an exhaust shop do it for you.