Hi mate,
the kit pistons are absolutely fine but you will prob need to drill them depending on what surface your racing on. I use standard Durango 2 hole pistons up front, drilled to 1.3mm and 3 hole pistons in the rear drilled to 1.3mm.
The GHEA pistons are tapered which means they rebound quicker. This helps on tracks with ruts and loads of small bumps as the shock rebounds quicker. This keeps the wheels on the ground ready to soak up the next bump.
There not essential but a good tuning option.
Craig
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