Question: If I look at the specs on a 7520 and the specs on a 6000, the only "difference" is a relatively low boost turbo to make the additional 15 hp. BUT, the compression ratio on the 7520 is less than the 6000 to accomodate the increased compression caused by the turbo boost. I'd think that a turbo on a 4530 (I believe we are talking about 3 out of the 4 cyl on 6000 (displacement wise) would require lower compression pistons to start, or you could potentiall blow a hole in the top of one/more with prolonged use with a turbo...am I missing anything here??/ I'd suggest forget the turbo and turn up the pump a tad...if you have to...bobg in Va