You don't neccesarily have to change out the pistons on a type R to go turbo. You just can't boost too high. The high compression with a small turbo, disco potato maybe, and a GOOD TUNE!!!!! would yield some nice results and still have great low end response. I myself wouldn't do it because I would be trying to keep making more power and I would pop it but if you could be satisfied with running a fairly low boost and having a nice little ride then go for it. I personally just think it's a sacrilege to boost a type R, but that's just me, there's plenty of people out there doing it with great results.