Syko Performance RB25DET Install - When The SR20 Just Isn't Enough

19. You should be using the RB clutch slave cylinder since the mounting holes are in different positions.

20. Attach your upper intercooler piping and aftermarket air filters.

21. Plug in the lower harness, reattach the ground wire to the passenger side firewall and connect the throttle cable.

22. The RB26 will require a resistor pack for the injectors because it utilizes low impedance injectors. This was configured by wiring the factory GT-R resistor pack in line on the positive wires leading to the injectors. The power was tapped from the S13 fuse box.

23. A factory KA (SR won't fit) radiator can be re-used but even slim aftermarket fans will have to be retrofitted to clear the front crank pulley. S13 owners should source a thicker S14 radiator, if possible. Install the battery, refill all necessary fluids (engine oil, tranny, radiator fluid and the like) and don't forget to plug in your RB ECU! Double check all hose clamps (turbo, intercooler and air intake) and cross those fingers! Fire it up when ready!

24. See? Marco's a happy guy thanks to Gary.

With a stock RB operating solely on RWD alone, Marco put down 306.72hp with 246lb-ft on SR Motorcars' Dynojet. Raising the boost and adding simple bolt-ons should yield close to 400hp. We went for a test ride (look out for a full feature and evaluation shortly) and all we can say is "WOW!" If you're even remotely considering the SR swap, we say save your cash for the RB conversion instead. The torque is incredible and a stock RB will far surpass the thousands of dollars that would make an SR fast.