You could even take off the resonators, purchase the 4.8 exhaust with the tips for around $900, sell your exhaust for cheap and still be out way ahead of Dinan et all on price and sound.

I have taken off my 4.4 sport tips and welded in the 4.8 tips. They sit about an inch further back than oem, but still look good. Wife does not want me taking off the resonators righs now but that was going to be my next project.