Thats some big power ! Is the car responsive ? Lets say you took it to autocross or track, would it still be as responsive as stock ?
I've never driven a stock sti so I can't really give you a good comparison. I bought my 08 with a blown motor as a project and my initial experience with it was at the initial pump gas numbers I mentioned. I find it to be incredibly responsive. Especially considering the size of the turbo. Boost Lab does offer a BL54XR which is basically a Garrett G25-660. It's a 49mm turbine wheel