Spark plug NGK or BRISK

I did reduce the gap of the PFR7Bs to 0.025" when I was running DriverMotorsports K04+ tune and it boosted more than 26 psi. I did so due to upper rev stumbling, but for being back to running my GIAC HO K04 tune...0.028" works. PFR7B usually work great with higher boost from turbos and tunes when you do notice the stumbling for having arc disturbance.

It appears you already have a good set of coils, start with plugs, buy good ngk plugs. These engines eat plugs especially once you start throwing boost at them, I’m running one heat range colder than factory in mine right now after smoking a factory spec set but I’m pushing 20psi so your results may vary.

Ive been using the Brisk USA Premium Racing Spark Plug 14mm... yeah I get it they are kinda expensive when it comes to spark plugs at little over 13 dollars a piece but trust me they are worth it, ive never had good luck with any of the spark plugs listed for the 2.5l, specially not with what I've done to it, iridium plugs, platinum, copper, Nicole, even ruthenium plugs.... but these Brisk plugs are killers, ive never had my car run this well before, even my throttle response is better and the heat range is correct as well..

Running the ruthenium plugs. Works good for me FR6AHX-S (94279)

Definitely get NGK’s - the parts store I went with initially gave me other plugs and even with a new DIC the engine was still misfiring without NGK’s

NGK is prob the best sparkplug for performance, Denzo is a cheaper option but there not as good for performance

If you live some where hot, have a tune, or are hard on the car I would do one colder and get the 2309 instead of the stock 7913.

Any correct sized , heat range and gapped NGK plug will work fine but some will need to be changed more often. BKR6EIX for example is a good choice, it is iridium tipped and not expensive.

NGK literally welded a platinum bar to the ground electrode. Is it going to be really butt dyno noticeable? Probably not. But at least it should last at least twice as long as the BKR7E-IX, since I've noticed after 20,000 miles, my mpg goes to crap. The projected square platinum electrode means wear resistance on the ground electrode, like the factory laser platinum spark plugs (PFR7S8EG) having a platinum wear disc on the ground electrode.

Most imports (To the US) don't like anything but NGK/Denso.