808muscle

Jim Jr at JDM told me to cut the HFs out asap after installing the m90. FI will melt the cats. Why risk it.

stealth_GT

This is a blessing in disguise. I can now run OR pipes with cut outs rofl at the track...

cfr865

What do you replace them with to prevent being to loud ?

stealth_GT

Possibly 22 inch resonators

Or a mid muffler and resonators, if you really want to clean up the sound. But thats a little overkill.

stealth_GT

How much power are you all freeing up when you guys eliminated your cats and went OR pipe? I am keeping the stock mufflers, I don't want it to be deafening just more power.

outceltj

When I had my salleen sc installed i asked brenspeed about having the Pypes Hi Flo cats and they seemed to think they would be ok. I have thought about changing them out maybe once a year. In my situation when I didnt have the hi flo's my exhaust had to much trumpeting. Thats why i had the hi flo's installed. So i think I will run with these Hi Flo's that I have right now and then at the end of the summer replace them and take a peak on the inside of the catts.

Simon1

Places like summit has resonators you can install inline to reduce the echoing of the catless pipes. They are fairly in expensive.

2007CalSpec

+1

Summit is where I got my Dynomax race bullets to act as resonators. They were $41.95 each.

red96v6

I have had my Paxton on for just about a year now while running Bassani high flow cats. They are metallic instead of ceramic so supposedly safer...

808muscle

When I had the HF cats in there I had pypes m80's and the sound was very good. When I cut out the HF cats I put in some cherry bomb glasspacks cause its the only one that would fit under there with the m80's already there. Sound is still loud but manageable.