Think you are paying more to have the gm warranty. Charging u ~7 hours labor for a 4 hr job. Of course I'm having to redo mine at my expense since first shop can't get it right. Think most non dealers are getting $500 labor. See if u can get them to drop a hundred off the price.
2012: Vmax TBody, CAI w/scoop, Solo HFC, ZL1 FP, Magnaflow TruX, Dynomax VT, RX catch can, HP Tune, BMR; Springs, Sways, Trailing Arms, Toe Ends, & Safety Loop, Pioneer Z150bh, Phoenix Gold Sub, Hertz speakers & 5ch Amp, SS rear with 3.91 gears w/Eaton TrueTrac, and BMR bushings, Baer Decela Rotors, Goodridge brake lines, Brembo(GM) 4 piston calipers, Hawk Ceramic pads, and Vredestein Ultrac Sessanta Tires, Ny-Trex Nitrous, and more. 345RWHP/354lbsTQ 12.8@108