Your VR4 heavily modded?
Have not use NGK7 before but have tried Denso Iridium IK22 which is about NGK7 heat range. To me not much difference since my VR4 is standard stock engine. Currently using back NGK6 heat range only....
The Subaru Impreza WRX Sedan has undergone many changes to it's front grille for the past few years. But none as dramatic as the one undergone by the...