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....
The new Hyundai Tiburon or possibly, the Hyundai Genesis was spied in Korea recently, FR, longitudinal engine is in but specs are unconfirmed. Pictures below illustrates that the Tiburon/Genesis will be similar to the 350z in size wise.
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