15.5" is how much you need to shorten for a Gp. Make sure its completely level when you join it back together. I had mine done by a pro (Flatlands engineering) as he does it on a jig to ensure its all square. Saying that though my mate did his on his garage floor with a tape measure and spirit level. His floor is spot on level though. Its a good idea to stagger the cut as this gives it more strength.
A forum community dedicated to aircooled Volkswagen owners and enthusiasts. Come join the discussion about performance, restorations, modifications, classifieds, troubleshooting, maintenance, and more!