Simple one, which plugs for a 94 WRX STi import... would my mods effect which grade (?) I should get? I hear people saying about lawn mower plugs do the job!

Whats mods would effect plug difference, and do you need to know any figures like BHP for example?

Cheers.

 

NGK PFR6B standard car or PFR7B if you have a modded car

 

im sure joz will be along shortly as he knows everything you need to know about plugs....id like to think of him as a "spark plug specialist".