The chassis stiffening kit is a must for ultimate handling- both the 914-6 GT and the 916 had them installed by the factory. You will never know what you've missed until you drive one with and then without the kit. The "with" is so much more definite in a hard corner, not suffering the chronic 914 flex. The kit is comprised of 10 pieces, and installation entails removal of the swing arms to weld in place.
Comes with pdf installation instructions upon request.