is there a big performance difference between a muffler versus catback. I was thinking of using the remus until after i can accumulate some cash. I need to spend money on the 3m clear bra, hid system, and some other small things. Plus i would like to make some big payment and maybe in 6 months get an exhaust and use the remus to hold me over. Plus need to buy a flip out touchscreen for the carputer. Figured i have a damn good exhaust lying around might as well use that. I guess i will wait and see how i enjoy the stock exhaust and if it will hold me over unless i get the itch.