I just put in a MAC Prochamber off-road H and love it. The total cost was :$334, including installation, shipping, Mils, etc. I got it off ebay brand new from a dealer for $204.99. By the way, you can get MIL eliminators off ebay for $34.99, half the price most places charge and they were brand new, perfect from a dealer. I kept the stock mufflers and catback, since the sound was exactly what I wanted - quiet inside the car, but with a much more throaty sound outside. It evewn lightly burbles at idle, all without being too loud. Under full throttle, it sounds awesome, in 5th on the interstate it's dead silent. The Mac Prochamber get's my vote. And the best part is you can purchase all the parts seperatly and do it over time if you need to.