Re: new exhaust
The "Best one" is subjective, I went with the true duals kit from newtakeoff.com and I am very happy, get compliments all the time, even from GT owners. I looked in to the FRPP true duals because I liked how it sounded on you tube, but as you said its very expensive. I think mine sounds just as good!
Northern Virginia Mustang Club
Silver Mustang Registry #1045
2010 Brilliant Silver 4.0 V6 Traded and will be missed
2011 Performance White Premium GT 5.0 6MT, 19" Machined Wheels, 3.73 gears, GT500 Axle-Backs, Eibach Pro Springs, Dynojet #'s 387rwhp/380 tq.