Most recommend stock NGK's, I'm one step colder because they were $10.00 cheaper.
If you begin to have missfire or issues, put NGK's in it.
210,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here