I was going to use the oem 2ndary cats not aftermarket. I already added 2 small body vibrant resonators after the v bands in the rear section and it hardly toned it down. You think the oem stuff would melt like your high flow did? I dont track the car, it will only see the occasional drag strip once weather cools down.

 

I would be real worried about using the nitrous with cats in place after what i have experienced with them on the track, the EGT's are much higher with nitrous on... I wont be surprised if the melt too.

 

well im placing them further back where the vibrant resonators were....I dont think the vibrant resonators did much at all. I just did the swap out and its still just as f'n loud as it was lol.