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....
What is the standard boost for the 4g63 engine in the Evolution 8? Is it 1.2bar or 0.8bar or lower? Is there any boost differences in Evo 7 , 8 and the MR? Like the 4g63 engine, is it possible to change...