These custom ARP 300 Turbo studs are what we use on our own in-house turbo systems. It's incredibly robust with double the clamping force you'll find in OEM t25 style flanges from the SR20. 

These are the same studs we use in the Fab9 GT Turbo System.

Choose between a 4 or 5 bolt application - They are M8x1.25 so it will fit both the downpipe flange and the manifold to turbo application. 

ARP Torque Specs

• Torque: no published ARP torque spec exists for these custom studs — follow the instructions included with your kit
• Threads: M8 x 1.25; use anti-seize on the threads going into the manifold/turbo

All torque values assume ARP Ultra-Torque fastener assembly lubricant (included in the kit). Do not substitute motor oil — ARP notes it produces higher friction and inconsistent clamp load.

FAQ

What are 'ARP 300' turbo studs?
These are custom studs we spec for our own in-house turbo systems. They roughly double the clamp load of OEM-style T25 flange hardware, keeping the turbo sealed to the manifold under heat cycles.

4 or 5 stud — which do I need?
Match your turbo flange: T25 flanges use 4 studs, larger flanges use 5. Choose the option that matches your setup.