Originally Posted by 6spd

well, when the 2 mods, tubes and filters, are done together, they produce worthy gains that, considering their combined price, make them a good alternative to the Stillen G3. They do alter the sound a bit, but most people wont notice unless you are more in touch with your car, while any power gains won't be "felt" except for much better throttle response in most rpm areas.

Worth it? Yes, very much so.