FAD2BLK93

I am in the process of putting on my coated Mac mid lengths and i will be getting the Mac cat back. My cat is already hollow, and there is no emissions in my area of washington St. So do i remove the cat for better sound? Will i gain performance with less turbulance? Or should i leave it in place for some reson i don't know about? Enlighten me Thanks

pillarpod

if its hollow already, its not going to change the sound if you left it or if you put a pipe in there.

FAD2BLK93

So i should remove it for a better straight through flow without the cat probably swirl effect maybe? Just guessing here, mainly wondering about sound then performance with the 503 cam if that matters?

1QWKT/A

iTrader: (2)

Check your state emissions laws. Some states require a "visual" inspection of the cat upon inspection. If you have a friend who is a mechanic it shouldn't matter either way. I would assume having no cat would give you a less turbulent flow. Turbulence is a function of the radius of the pipe among other factors and the cat has a larger radius than an exhaust pipe would.

FAD2BLK93

No emmisions at all where i live, visual or otherwise. Just go in show ID pay 50 get the tab...so great.

SS RRR

iTrader: (2)

Hollowed out cats sound like stale ***. You'll notice a good difference in sound if you put straight pipes in.

wrd1972

iTrader: (12)

I had a gutted cat on my jeep Wrangler and it sounded funky. Just drop the cat and install a "test pip" which is 100% legal as long as you are conducting "tests".

I have been running "test pipes" for many years trying to determine if catless exhaust contributes to global warming. As of now, the jury remains out but with that said, I will assume the Polar Bears are doing fine because I saw some lively ones on a recent Coca Cola spot on TV.

VinR1

iTrader: (17)

Google 'Allflow'

wrd1972

iTrader: (12)

That is awesome.