We always recommend replacing your spark plugs if they haven’t been changed within the last 10,000 miles — especially before upgrading turbos or increasing boost. When you begin modifying and tuning your 991.2 or 992.1, starting with fresh plugs (and healthy coils) removes one of the most common causes of misfire and inconsistent ignition.
Once you increase boost on the 3.0L or 3.7L twin-turbo flat-six, cylinder pressure and combustion temperatures rise quickly. At that point, spark plugs stop being just a maintenance item — they become a reliability component.
When boost increases, many builders step one heat range colder than stock. In NGK terminology, a higher heat range number means a colder plug (it sheds heat faster).
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• Reduced plug tip overheating under sustained load
• Lower pre-ignition risk (a hot plug can act like a glow plug under extreme cylinder pressure)
• More stable combustion at high RPM and sustained boost
• Improved durability during track use or aggressive street driving
As boost rises, ignition stability becomes critical. A plug that is too hot can contribute to knock sensitivity, timing pull, and misfires when cylinder pressure peaks.
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.
