i purchased a cat replacement pipe from racing beat and it is way to obnoxious for me to deal with and i am going to send it back. Rx7.com also has a cat replacement pipe w/ a presilencer and i am curious on how that will sound, they also have a legal system but i would imagine there wouldnt be much of a difference from stock, and it a bit more pricey, ($245 compared to $125, plus shipping) have any of you used any of these systems? what where your results? thanks