I have been looking into Borla ATAK catbacks for 5.7 HEMI R/T. I have heard it in person and a lot over the internet. Very happy and interesting expect one problem.....cost. Its a pretty expensive system. However I have come across the borla xr-1 mufflers (that have the same muti-core design as the ATAK muffler) for a fraction of the cost of the cat back. My question is...will XR-1 mufflers (with no resonators) and a x-pipe be like the ATAK catback? Thanks!