At this level, reading every plug is critical to ensuring the tune and fuel are supporting the nitrous you’re injecting. Ours looked perfect after each pull. To step up to 200 hp, we poured in VP Racing Fuel MS109, swapped to plugs two heat ranges cooler than stock. Macy pulled the total timing down to 20 degrees and leaned the air/fuel ratio to 12:1. We actually ran this test twice, producing consistent numbers, but a touch of flutter at the top end and visible flame from the headers told us we were basically blowing out the spark despite squeezing the gap down to .030 inch. Our LQ4 was maxed out in this form.