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I used them briefly. Long story short, they were causing multiple misfires on all cylinders. I took it back to my tuner thinking it was a problem with the tune. We were chasing misfires all over and pulled plugs and wires. We ended up putting the stock wires back on and problem solved. I sent them back to Granatelli and got another set, but I haven't put them on. They claim they couldn't find any problems with the set I sent back, other that 2 of them separated internally from taking on and off.
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