Exhaust is a preference thing. If he wants stupid loud then go for the LMs and an offroad x. Personally I prefer the classic muscle car rumble you only get with original 30 and 40 series flowmasters. Couple that with an offroad H pipe and you will have loud and beautiful sound. Throw a couple high flow cats in and it quiets down nicely. But slp lms are cheap and they just make big noise...
2003 Mach 1