stock compression on GTiR is 8.3:1. Normal SR20DET is 8.5:1 but GTiR has larger combustion chamber so it drops off a bit. Even the CP 9:1 pistons was around 8.8:1. The pistons I'm using a stock replacements, but machined the head down to 20 thou protrusion (i think) which pumped it up to higher than the original CP setup.
the pistons with 10+:1 are more for DE and VE heads. but you'd have to back off the boost anyway? Not planning on making much more power, just hoping for more useable torque. Wont be running E85 just yet if thats what you're asking. Not many documented, tracked pulsars on E85. I know of one, and his hasnt run the same since. We'll see how this setup goes with the current turbo first on 98, and will weigh up E85 later.