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....
Well turns out I'm gonna be needing a new pair of front rotors. Currently have Endless 6pots up front with the 355mm. I had previously asked around for prices maybe a year ago and they were in the RM3k range per pair...