I put decent spikes on Jon's car and he was way happier with it, improving by over a lap. I had only chance to do about 2 laps with it, but it felt pretty good to me.
I ran new pins in mine which were way too much up front, so I went to more worn fronts. I think the spikes were better on the slippy stuff, but the pins gained you a ton of time where there was carpet. So probably pins were ultimately a bit faster but harder to drive.
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