typically smaller engines benefit the least from modding. You might gain 10 HP with a CAI, maybe more maybe less, depends on how restrictive the OEM intake is. Same goes with exhaust. While you'll probably not find a cat back system for this engine, or a header set either, even if you did it will only produce more HP if the stock setup was restrictive. There's no real way of knowing since nobody really keeps track of these things. Another way of freeing up HP is synthetic oil like Royal Purple...again on a V-6 you may gain 3 or 4 HP but there's really nothing out there to give you 50 or 100 hp gains unless you're willing to go to nitrous oxide, turbo or supercharger...but by then you'll probably grenade your motor and it won't be worth it.
