When it comes time to change your spark plugs, you may wonder about colder stepped spark plugs as many others have. Colder spark plugs work by pulling more heat out of the engine's cylinders (making them "colder") and dissipating it into the engine's head, which is then cooled by the cooling system. Depending on how you have your engine built, these could be a great addition! Colder plugs can help prevent engine knock and prevent the tip of the spark plug from melting or misfiring. There are two rules that most people tend to go by when deciding on which spark plugs to buy: The first rule of thumb is that with every 100 horsepower added, you should run spark plugs that are a step colder than your stock plugs. This is generally accepted across the motorsports community but unfortunately isn't always the most accurate measurement of when you will need colder plugs. The second rule is to go a step colder any time you massively alter cylinder temperatures by adding forced induction to an NA engine, by increasing compression ratio, after altering timing in a major way, or by changing fuel types to something with a higher octane rating such as racing fuel. Adding spark plugs that are a step colder outside of these conditions, with no real change to the engine, can actually hurt more than help by leading to spark plugs fouling quicker than normal and by making the car harder to start in cold weather conditions. We suggest talking to your engine builder or tuner before making the change, or you can call our Turner Motorsport sales staff to discuss what modifications have been made to your vehicle and see if these plugs are right for you!
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Constructed from high-grade lightweight titanium alloys, the Evolution Line (Titanium) exhaust system has been perfectly tuned to deliver the very best aural experience in all driving modes. Through extensive testing and development, the Akrapovič sound engineers have coaxed a deep, sporty, higher-frequency V8 sound from the car’s turbo engine, more akin to that of a muscle car, while keeping it smooth and eliminating any drone that might hamper the enjoyment. The full titanium exhaust system is finished with two sets of carbon-fibre / titanium tailpipes coming from a central muffler layout featuring two valves, one located on either side of the muffler. The housings are cast in-house in the Akrapovič foundry, and there is a cast collector on the link pipe, where gases from both sides of the engine mix, all designed to create a perfect sound. This plug-and-play exhaust system can be further regulated with the addition of the Akrapovič Sound Kit to control the valves in the exhaust and switch between the sound modes. See T#599277 for this sound kit. Fittment notice:This system does not fit on vehicles equipped with Otto particulate filter (OPF). This exhaust system is not CARB approved
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The optional Akrapovič Sound Kit enables owners of selected Akrapovič car exhausts to control the sound of the system from the cockpit of their machine. Using Akrapovič technology, drivers can easily switch between the quiet mode and a sportier sound. With the use of a receiver (already included in evolution system) to drive the actuators that open or close the valves at the end of the exhaust system, drivers can use the Sound Remote Controller or the new smartphone app (for iOS and Android) to regulate the valves. With the use of the optional Akrapovič Sound Kit, the ECE type approval is no longer valid. Pictures are symbolic.
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