I think it's very helpful, whenever contemplating an expensive purchase for your hobby, or anything else for that matter, is to sit down and put on paper what your trying to accomplish and what your expectations are. Often an urge to make a purchase happens when you see someone else do it and it seems like a good idea. But, after some contemplation of the pros and cons of the purchase, the glow dims, a lot. Full exhaust systems are about $1000 or better if you want one that actually performs as advertised. Then, you will almost certainly need a fueling modified (PCIII or PCV) for another $300 or better. Finally, you need some dyno time for anothe few hundred bucks. If you are really expecting a good H.P./TQ increase you should be able to calculate how much it will cost to attain your expected result. If you don't actually race, you'll never use the increase on the street. I don't mean to take the wind out of anyone's sails, but be smart about spending a lot of money for something you'll seldom or never use. In a time when it's getting far more expensive just to put gas in the tank, does anyone want to end up with a screamer they can't afford to ride?