These are the billet wheel version of our ko4 025/26. These turbos utilize a slightly bigger/taller compressor wheel and are rated for 28 psi. Assembly of each set is done in house at the S.E.P Auto facility and all machine work on the housings are done locally. These are great for e85 built motor applications and come with pre-set one bar wastegates and includes a 1 year-unlimited mile warranty through S.E.P Auto.