We always recommend you change your spark plugs if you haven’t changed your plugs in the last 10,000. It’s always wise to start out with fresh plugs and coils when you upgrade your turbo and begin your tuning saga.
When you go bigger turbo and raise boost on the 2.0L, cylinder pressure and in-cylinder temps climb fast. That’s exactly when spark plugs become a “reliability part,” not just a maintenance item.
The 718 2.5L plug (NGK 91731 / SILKGR9A7EG) is a colder heat range plug than the common 2.0L plug (heat range 9 vs 8 in NGK terms, and higher number = colder).
• Less chance of the plug tip overheating under sustained load (the plug sheds heat faster).
• Reduces pre-ignition risk (a too-hot plug can become a “glow source” when you’re really leaning on it).
• More stable operation at high load / track use, especially when you’re pushing boost in the upper RPM where heat soak becomes real.
• A colder plug can be more prone to fouling if the car does lots of short trips, idling, rich cold-starts, etc.
• This isn’t a “free power” mod — it’s a safety margin mod. You choose it when your use-case is higher load / higher heat.
If you’re increasing boost on a 2.0L (especially with a larger turbo), stepping to the 2.5L heat range plug is a common, logical move for knock/pre-ignition resistance and high-load durability.
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.
