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....
where is the best and good place to service a turbine.. just wanna know..
my turbo kong'ed ... leaking .. bearing also bad shape.. no boost .. no pickup hehe..
anyone else experience like this ah ?