Back a few years ago (about 91) I used to run these Torque Master .
Back then the guy used to hand make them out of modified Bosch plugs. I swear they made a difference and they lasted for as long as I kept the car (sold it in 2000 - about 8 years).

SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq NEW: 19 Goldwing Tour DCT