PT-Tuning http://www.pt-tuning.com/performance...ackSingle.html makes a "drop-in" straight-through muffler
for $225.95--"Features T-304 Aircraft Quality Stainless Steel 2-1/4" Mandrel-bent Tubing, TIG Welded polished Muffler Body with Polished Inter-cooled Tip,
Easy Bolt-on Installation using factory mounting locations, Ground Strap Lug on Muffler. This PERFORMANCE system has a deep sporty sound in the turbo application -- not too loud...Now Specially tuned for the 2003 GT Turbo! (Still works great with non-turbo, too!)"
Understand it's an "easy install" according to others on the forum.
Just a consideration. Good luck.