Fit your Turbosmart fuel regulator to the stock fuel rail with this adapter.

Turbosmart Fuel Rail Adapter - Mazda/Nissan/Subaru TS-0402-1001

Turbosmart fuel rail adapters allow the use of an aftermarket fuel pressure regulator on the stock fuel rail.

Part #TS-0402-1001 applications:
Mazda 13BREW - FD3S RX7 Series 6
Nissan SR20DET - S3, S14, S15 Silvia
Nissan RB26DETT - BNR32, BNR33, BNR34 GTR
Nissan RB26DET - HCR32, ECR33, ER34 Skyline
Subaru EJ20 - GC8 WRX before Bug Eye
Subaru EJ25 - WRX 08+ (non STi)
Subaru EJ25 - Liberty 05+
Subaru EJ25 - Forester 08+

This is the adapter only, does not come with fittings.