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....
Can anybody here provide a good setting for greddy profecb boost controller..My aim is 1.1 bar for low boost and 1.5 bar for high boost..a few of my frens already told me that for this one you have to do trial and...