The easiest things to do? Buy a new intake and a couple new mufflers. A good ram air intake will up your HP about 8 and make the engine sound a lot better. Go to K and N's website; I know they make a typhoon kit for the TL. A cat back exhaust would usually be too expensive, so go to a performance muffler website and buy a couple universals that will fit the TL's pipe diameter. All of this should run you under $1,000. Oh and about turbocharging: comptech makes a supercharger kit for the TL, but that's about the only one I know of. I would stear clear of boosting a TL because A.) it would cost well over $2,000 and B.) the engine is already a high compression; boosting it would be a bad thing.I used to have an '04 Acura TL. I improved my acceleration and 0-60 times by getting an '07 Infiniti G35.