Howdy AB!
Not Viper specific, but I have Supermaxx headers on my Z06 and the build quality is excellent - echos the same I've heard from other customers as well. Excellent pre-buy customer service as well.
I wanted SS, and a complete setup (headers, hiflo cats, X-pipe), the system I got had all that, plus really clean welds, every single bolt, gasket, for the install (I did a DIY), decent instructions. etc. I've had no real issues post-install, going on 5 months.
I'm on deck to replace the Z with a late(r) model GTS, and I would (assuming I don't buy a pre-modded car) seriously consider Dynatech again. Apparently the guys come from a pretty experienced race background too (in fact, Dynatech is part of Accufab which owns like USBrake and some other race part manufacturers).
I found the pricing for their headers was very competitive as well.
Seeya -
DT
