Which R/T cats for a N/A car?

[kcobean]

Hey Guys,
Browsing the partsrack web-site and I see 3 different Random-tech cats listed. There is a 2-1/2 inch in/out, a 3 inch in/out metal honeycomb, and a 3 inch in/out stainless steel. This will be connecting to stock piping on the front side, and to a corsa 3" on the back. I'm just wondering which ones I should be ordering. I'm guessing the 3" is best because that would require an adaptor only on the front side. Any input greatly appreciated.

 

[ViperJoe]

3" SS RT's should suffice for light to moderate mods.

You will also need the adaptor to transition the stock header pipe to the 3" RT inlet.

Jon at Partsrack can give you a "package" price with everything you need.

I bought 2 complete systems for my Vipers and Jon beat everyones deal.

Check the how to section for helpful hints on the cat-back install.
good luck

 

[RAYSIR]

I just did the same last week on my GTS. Jon's price was less for the package and had to get the 2&1/2 to 3" adapters also from him. I was short clamps for the adapters to stock header so got a 2.5" flat SS clamp from NAPA and welded the 3" end into the front of cat on the bench 1st before hooked to car. Everything fitperfect.Start from the rear to front since you may need to cut the pipe shorter at the rear of the cat.I used the RTech 299.00 cats and the RTech 3" back with no rear resonators. To me they are too load on the GTS with big hollow truck so I'm planning to swap my Corsa on my RT10 to GTS and RTech to RT10 where I can hardly hear the Corsa. But see if you can get cheaper freight.