now its a simple question.. i have a 2007 stock rx8. will a cat back setup exhaust shoot any flmae out the back? or will the cat restrict to much and not give any? im have my GREDDY SP2 im puttin on today.. just wondering.. and if i have to get a high flow cat, how much louder is it going to make it?

Its unburnt fuel and if your exhaust get that hot yes it will.

if you have stock cat and its working, you should have throw any flame. cuz its illegal to do so and if a cop sees it, you'll get a ticket for sure.

Fire R Coolz