Description
One of our best selling items, Subaru One Step Colder Spark plugs are one of the best items you can add to your 2004+ STI or 2008-2014 WRX. A simple, and effective modification that gives you peace of mind. Turbo cars require stronger spark and these are a great idea to add to any part install or before tuning. Poor condition spark plugs can cause misfires especially when boosting, which destroys performance.
Why go “one step colder”?
Running a “colder” heat range spark plug will reduce temperatures in the combustion chamber by wicking more heat into the cylinder head. This reduces feedback knock and fine knock learning when running gasoline tunes.
Recommended on ALL 2.5 WRX/STI making over 280 whp.