The RaggDoll Motorsports Inconel Head Bolt Kit is purpose-built for Porsche 718 Cayman and Boxster engines that demand more than OEM hardware can deliver. Whether you're running high boost, tracking your car regularly, or building a fully forged setup, these bolts provide the strength and temperature resistance your engine needs.
Inconel is a nickel-based alloy known for its exceptional performance under high heat and pressure. Unlike standard steel or factory bolts, Inconel hardware maintains its clamping force even in the most extreme operating conditions — protecting your head gasket, maintaining cylinder seal integrity, and improving long-term engine reliability.
If you're pushing your Porsche 718 Cayman or Boxster beyond factory limits, the RaggDoll Motorsports Inconel Head Bolt Kit is a critical upgrade for durability and peace of mind. Designed for serious power and serious performance, this kit delivers next-level engine integrity where it counts.
Liza & most of the time Vince is amazing...lol. Nah, kidding, these guys are awesome folks to deal with. I purchased their Stage 2 turbo, turbo inlet, intercooler, engine tune, and high pressure fuel pump for my 2018 2.5L Boxster GTS and they're products and service have been top notch throughout the entire process.
Raggdoll Motorsports set up two dyno sessions for my Porsche Turbo S. The Porsche touts a 4.0-liter built engine and head work facilitated by Sam at ByDesign. Also has the XR ByDesign turbo kit with all the supporting mods. The first session the PDK kept transitioning out of manual mode. During the second session a boost leak at the throttle body boot ended the session early. We managed 812 hp on a Mustang dyno at only 20 psi of boost.
The people behind RaggDoll Motorsports have been in the game for a very long time and really know their stuff. They have a passion for modifying cars and are enthusiasts before anything else.
I purchased a RENNEN turbocharger for my 718 T. I had a special request, which was to get the turbine housing coated with Swain Tech white lightning thermal barrier coating and RaggDoll accommodated without hesitation even though it was something new for their team.
Hey All! Shout out to Liza and @Raggdolls718. Amazing customer service, product knowledge and a top quality product. Liza went out her way to accommodate my tight timeframe and the level communication and level of detail shared was amazing.
I purchased the Raggdoll Series One turbocharger upgrade and the turbo inlet upgrade from RMS for my Porsche 718 Cayman GTS and was very pleased with both the products and the customer service from RMS!
Engineered for the 718 platform, trusted worldwide. RaggDoll delivers high-performance parts, custom turbo innovations, and expert-level support for Porsche 718 drivers and tuners—from Las Vegas to Germany, Hong Kong, and beyond.
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