rotofab, 1-7/8" Stainless longtubes, TVS1900, tune, done. You don't need to change the DOD hardware or cam (people are running SC on stock internals) but you can. Add that into the mix and you're talking probably $10,000-$12,000 w/ the labor. That's without factoring in suspension mods and brake overhaul but I assume that will eventually need to be done anyhow as part of maintenance.
Are you a rich 20 year old?
'08 GT sport/premium, tints 20/35, 18" TSW nogaros w/ bridgestone blizzak winter, 19" sport oem w/ hankook evo summer, Philips crystalvision bulbs, debadged, Vararam OTR, JBA 1-3/4" LT's, ported TB, MF axlebacks, MF X-pipe, DBA-powerslot brakes, russel SS lines, hawk ceramic pads, GXP shocks/struts, lovells poly strut mounts, Slowhawk Tuned 344/356
Gone -'04 GTO A4 2.5" custom exhaust, sweet thunder muffs, H pipe, Z06 heads, Baer brake it, 20% tints, torrid red, AEM brute force intake, tuned