You can expect an increase of 3 to 4PSI (peak boost) but the real improvement is in the mid-range

Nissan 370Z rear suspension with with convenient camber adjustment and bumpsteer correction

BMW and Lexus steering rack attachments and crossmember inserts are included in the kit

it doesn't fit JR10 wheels which originally have higher conical cap

Rack installation guide

Vesser VSR4 20x9 ET20-51 5H BLANK Custom Finish Ceramic coating You can expect an increasePCD: 5x108, 5x110, 5x112, 5x114. 3, 5x115, 5x118, 5x120, 5x120. 6, 5x127, 5x130 ET: 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51