Not worth it. The JDM Type S has only 20 more flywheel horses the the USDM Prelude. Much better can be had with the aftermarket. If you were to use aftermarket parts and swap in some high comp. pistons, high duration cams, intake, tb, im, header, and exhaust you would be mush quicker then the JDM Type S. It would also be alot cheaper too. H22A1 is the closed deck and the H22A4 is the open deck I believe. Correct me if I am wrong.