This is what i would say is the ebst bang for the buck and sounds amazing...
MSDS headers...you can get them for 200.
optimized stock y...I had mine done and welded a 2.5 pipe from the y to the rear where it splits into 2 parts again for about 60 bucks. I think you could stop after that. Then you have the
headers to optimized y...2.5 all thw way back where it splits to 2 2.25in and the SVT mufflers flow pretty well.