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....
Hot off the heels of their MP4-12C, McLaren have already reportedly been working on a flagship supercar that would have the likes of the Bugatti Veyron in its...