Great thread. A lot of "well saids" from many perspectives.
I completely understand the need to mod, and agree a C14 Turbo is the best option for anyone who truly wishes for more than what simple bolt ons provide. The reports from the turbo owners on here definitely make me envy those with both the determination and the funds to build a truly sleeper ST...
But, at the same time- I sort of feel like this is a case of giving a Clydesdale methamphetamine in order to run it in the Kentucky Derby. While a winning finish would amaze everyone trackside, it also would stress the animal way past what it's maker intended.
Back many years ago, (mid 1970's) I managed to score an Ak Miller/Shelby/Spearco turbo kit for my 1971 Ford Pinto. Running 14lbs boost, with water/acetone injection coming on at 7 lbs (to keep from blowing it up)-- that little econobox managed to put the hurt on a lot of "muscle" cars of the day- (AAR Cuda driver was completely amazed). But, over time, the engineering shortfalls of the drivetrain started showing up, and when I eventually opted to sell it, I did so, because it didn't make sense to fix them all. I could build a Pinto to the Moon, but it's still a Pinto.
Of all the more power options mentioned- I like the idea of starting over with a literbike. Faster and better handling to begin with, it will always have the performance edge given similar investment. I also wish Kawasaki would put the new ZX-14R engine in the C-14, along with a bigger tank to support the mileage penalty.
Just another $.02