Dustin at CPR has used It, JPC, Terry at beefcake, I've reached out to multiple owners I've hunted down owners that have switched from boss or CJ to it. No same day back to back comparisons though. It's the shortest runner manifold we have, it's going to make more power. Everyone I've at least reached out too has reported decent gains over CJ.
It's tuned for 8000 peak rpm power. The results I've heard from some NA guys have been 10-15. When you factor in you don't need the a pricey CJ type throttle body or their intake its not terribly far off unless you're comparing new mmr price vs used CJ. It also requires no engine mounts or notching which can add to the cost if you didn't lower the engine.
As I've said NA guy's have seen 10-15whp gains. If you doubt mmr call them like I have. Everyone that's used it had been happy that I've spoke with.
I meant for expect specs. I've spoke with people that use or have used it. Gains were made even over the CJ by a nice margin. Not sure why a second or third party vendor needs to spend money to do back to back testing when you can reach out to owners. :shrug: there is info out there it's just not to your standard.
I can't find info from any unaffiliated owners of it that substantiate anything. I've looked. It just isn't there. Just because it is available for the GT350 guys as an option because they won't have to modify or change there hood does not equate to it being a worthwhile mod for the money.
Have you reached out to owners that have switched from CJ? Some of them have shared dynos via PM with me. Like I said, I've gotten answers. It's better than staying on the stock manifolds or paying double for a custom. Worth is subjective. :shrug: