Subaru Head Stud Kit Impreza WRX STi EJ20 2.0L & EJ25 2.5L CP882

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Vehicle Fitments

Fits all Subaru Impreza WRX & STI TURBO EJ20 2.0L and EJ25 2.5L DOHC Turbo Engines.

Package Content

12x Heads Studs (M11 x 195mm)
12x Nuts (M11)
12x Hardened Parallel Washers
1x 9/16 12pt Socket
1x 4mm Allen Wrench
1x Fastener Assembly Lubricant
1x Instruction Manual 


Head Studs Vs. Head Bolts

In every diesel car, there are high cylinder pressures that can damage head gaskets. Factory OEM head bolts are torque to yield, meaning you torque the bolt to a specific torque with a final 90-degree rotation that will place the bolt at its’ maximum stretch point.


Our observation through years of dealing with trucks is that when you add parts that increase horsepower (turbocharger, injectors, chips etc.), you risk creating higher cylinder pressures lower than your RPM range, consequently leading to a blown head gasket.


In contrast to head bolts, head studs are engineered to not stretch. Xotic Performance head studs are created using premium steel alloys (XOTIC 7200) that are far superior in tensile strength to a bolt. Our head studs are threaded on top to allow for nut placement which will result in a more accurate torque of the head.


Rather than blowing your head gasket again, we highly recommend replacing your head gaskets with fasteners that have a proven track record of not stretching - so that you never have to deal with the exhaustive procedure of replacing another failed head gasket.



XOTIC 7200 material properties allow for far greater tensile strength compared to 8740 Chromoly steel head studs. Threads are rolled after heat treatment for optimum fatigue strength. Premium quality inspection standards ensure you'll never get a blow head gasket again. 



Broached stud ends install & make cylinder head removal easier. Engineered to unleash more performance out of your vehicle. Ample clamping strength prevents cylinder heads from lifting. 



Head studs are designed to retain cylinder seal even with today's extremely high-pressure turbo systems. These studs far exceed clamping forces provided by standard Ford head bolts.



26x Heads Studs, 26x Nuts, 26x Hardened Parallel Washer, 10x Rocker Bolts, 1x Fastener Assembly Lubricant & Instruction Manual. Black oxide finish protects from wear and tear. Hardened parallel washers allow for uniform load distribution and accurate torque readings.




All details including torque recommendations are included in the manual for your reference. 


    Customer Reviews

    Based on 1 review
    Bryson Peacock (Portland, US)
    EJ20G closed deck

    Completed a refresh of my 1996 WRX STI RA closed deck engine and utilized these studs. Have heard great things from my diesel friends on the cost vs other name brands in the market. If they are working in 1000 HP diesel applications, than a Subaru should be a walk in the park for these studs. Excellent fit, great packaging, came with everything I needed to get rid of the torque to yeild factory bolts. Straightforward instructions. Followed the information on the installation sheet, and have been very happy with the results. Engine runs great, with the added protection of studs and headgaskets. Have ran up to 30 lbs of boost, no problems so far. Daily drive it about 17 Lbs.

    Frequently Asked Questions


    Do you have any certificate/tensile strength exam that can attest to the tensile strength you advertise?

    Yes, please click on the following link for a tensile strength report by Atrona Labs. We test our head studs extensively to ensure premium quality standards. The video demonstrated in this short preview highlights one of many spot inspections performed for our head studs. 


    Do these head studs come with paperwork? 

    Detailed instructions are included as part of the kit. 


    Does the kit include an assembly lube?

    Yes. Assembly lubricant is included as part of the kit. 


    What is the tensile strength?

    220,000-240,000 PSI. 


    What material are they made of? 

    XOTIC 7200 head studs are made from premium steel alloys that allow for far greater tensile strength compared to 8740 Chromoly steel head studs.


    Do these come with instructions/torque sequence for replacing 1 at a time with the heads on?

    This kit includes instructions with torque specifications and sequence.