You can expect an increase of 1 to 2psi (peak boost) but the real improvement is in the mid-range

7psi Inner Spring (installed)

These kits offer a significant increase in clamping force (30-60% above the factory clutch) over the Heavy Duty equivalents and are designed specifically for vehicles that have had significant aftermarketing tuning and performance upgrades

Fitting Kit - Suit FPR800 (Silver) Allows the use of -6 Fuel Supply fittings with the Turbosmart FPR800 Fuel Pressure Regulator

The modular System can be mixed & matched and added to with components such as further reference and sensor blocks (Available Separately) for a neat and tidy engine bay solution

JR Wheels SL01 18x8 ET40 5x120 White Lexus You can expect an increasePCD: 5x120 ET: 40