The dynojet is ok, I suppose, but being able to shift with a button is a game changer. I held out for the longest time on my turbo 10R when it came to extra wheelbase and an airshifter... in hindsight I kick myself for not doing both much, much sooner. It's worth it. Fun fact: you can set it up on a window switch/nitrous controller and it will hit each gear change at a pre-determined rpm, so long as you don't have to worry about wheel spin/wheelies that works out tits.
I need to dial up Robinson and see if he'd be willing to do a set of final reduction gears for some big mph... it's been a while since I've spoken with them.