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I reached out to iGrip to see what studs they recommend for the pre drilled Silent Drive 2 track. They got right back to me and recommended the ST-18R but said to not run them down the middle because the heat exchanger is in the middle front. I was planning on getting tunnel protectors and studding all locations like any other sled. Is the Grand Touring different?
 

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All G4 sleds keep away from the center.
 
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boost junkie
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its not the heat exchanger that causes the problem...the one tunnel protector is in the center and studs will destroy it alowing the track and other studs to destroy the tunnel
there is no replaceable heat exchangers on a g4...its part of the tunnel
 
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