haha way to be helpfulwhy not just go straight pipe
the smell is only on the outside behind the car...i have alittle bit on fuel smell since i have a fuel return system but i'm running alittle rich due to the AEM liking to be at 12.8afr so i smell unburnt fuel coming from my exhaust...i kinda want something like stock where you cant smell anything...haha way to be helpful
To the OP
Are you sure the gas smell isn't from your catchcan breather/ valve cover breathers? Thats where my smell was coming from, i ran the breather tube under the car and now, no more gas smell.
If the smell is due to your exhaust, yea a cat will help. I've got a Random Tech 3" (the Racing one) and so far haven't found it to be restrictive AT ALL. If i were you i'd look into that 4" Random Tech that was mentioned above, or get a 3" if your at ... umm i dunno ~<550whp? Basically, i've been totally happy with my 3" on my 410whp boosted 2jz.