headers are so easy on a 5th gen. I am a private guy but will install near Richmond VA. Tune is up to you. I have installed a few sets so far and they fit great. What brand? I will put them on for half what you were quoted.
#917 A6. email@example.com 1.55 60' (608/620) 2:13 VIR full. ADM race CAI, ATI/Lingenfelter balancer (10" ring), 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Texas Speed 1 7/8" headers(no cats). M/T 305/35-18 drag radials & M&H 28x4.5" bias skinnies. Toyo Proxes R888 285/35-20, Hawk DTC 70/60, 8.66" ring (508/540).
'15 Z/28 #325 black a/c & stereo. Stock...for now.