It took about 45 minutes of work to get the TNT ring to bolt up to the 90mm TB. I had to enlarge the TNT ring by ~ .125 and cut the o-ring down slightly.

 

That's nice that you can get it to fit, but aren't you still reducing the I.D. down back to a almost stock inlet? I know that was the problem with the HPE rings. They fit around the TB, but the inlet was no bigger than the inlet on the TNT ring, plus there was a large drop off where the inside met the TB.

 

I also bored the inside shoulder.
Phil

 

Isn't there a power ring that is a direct fit for the 90mm set up?

 

Yes, I didn't want to send another 150 if I am going to go to direct port this year anyways.
Phil

 

Yes we keep them in stock.Ours is the only one on the market that is a true 90mm.
Dave