While I have the 392, I disliked how the valves would close and ruin the cold start sound. I installed the Z Auto modules and couldn't be happier. 
yep, here's where I bought them. Pricey but worth it to me. 10 minute install. No permanent modification.what's the website for those, I'm interested. Thx in advance
Nice rumble.I have a T/A 345 A8 and my active exhaust is always open (done by a speed shop). When I startup, I get that high idle than slows down to that lopey sound.
Yes, I didn't get any codes when I installed them. And the valves stay open all the time.This will fix my error code for valves correct.?