Originally Posted by manari06
They replace the Pri Cats! you will have to cut the cats at certain point and replace with the Test Pipes by clamping or welding is your choice. you can run it with the factory exhaust, with a full Exhaust you will be removing the test pipes and getting ESS to create another file with the full exhaust configured in it. If I'm correct that's how it is.
I've read in many posts that test pipes don't sound very good w/ the OEM mod. I was worried about that when I decided to do primary cat delete. Ultimately I wanted the power so I scrapped my OEM mod and got an AA