your car shouldnt get much different soundwise from the gutted precats, my friends cougar with a borla just got slightly meaner but it needed it. MSDS headers add some rasp too. I've never noticed a gas smell riding with him, and he hasnt mentioned it. sometimes on cold starts and idling I can smell gas with a 100% stock setup on my car
2001 Mustang Bullitt
Dark Highland Green #0048
Performance by Ford Racing, Bassani, SLP, H&R and etc.
Former owner of a 99 Silver Frost SVT
GetOnItRACING