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  1. Hello, I have a 2017 Sierra SLT Crew Cab 6.2L with a Magnuson TVS1900 on it. The pulley and boost are stock from Magnuson, so probably 8psi max boost. I want/need to replace the spark plugs because I get a little bit of ping when really engaging the supercharger. The ping is very short and goes away, but it even does it with around a 94 octane (mixed 91 with 100). It is much, much better with the 94 octane, but it is still detectable. My questions are: 1) Should I get a one or two step colder plug? 2) Should I lessen the gap to 0.028in or 0.03in? 3) Should I get projected or non-projected tips? 4) THE BIG QUESTION, do I need to get the exact same size plug as the stock ACDelco 41-114 (aka GM part number 12622441)? The REACH is what seems to be different. I believe the stock plug specs are: Heat range: 16 Gap size: 0.04in (1.02mm) Reach: 0.98in (25mm) THIS IS WHERE THE NGK PLUGS DIFFER Hex size: M16 Insulator height: 0.99in (25.3mm) Seat: Tapered The plugs I am considering are Brisk (which have the SAME reach) and NGK (which have a DIFFERENT reach). Eight of the Brisk plugs is way more expensive than NGK. Brisk RR14YS - two steps colder, projected tip, 0.028in gap, same REACH as stock Brisk RR14S - two steps colder, non-projected tip, 0.03in gap, same REACH as stock Brisk RR15YS - one step colder, projected tip, 0.028in gap, same REACH as stock Brisk RR15S - one step colder, non-projected tip, 0.028in gap, same REACH as stock NGK BR7EF 3346 - two steps colder, non-projected tip, 0.28in gap, 0.709in (18mm) REACH which is different than stock NGK BR6EF 3177 - same but one step colder
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