A months good .Had pulse plugs fail in 6 miles ( 2 sets). Ngks best (PFR6Q)but its wont be the cars fault. UNLESS there nology silver they jurk on boost (stage 1 map).

But never failed. Cant beat ngk.

AGUS LOVE ngk OR Bosch 4S (but never used them) ( i class them as cheap).

Years back max power showed the gains of plugs bosch 4 , they sucked but do there job well.