I have owned a 1991 300zx twin turbo since new. The car has 49,000 total miles and I am restoring it to better than as built from Nissan. This car will be put up for sale as I want to move on (New Boss 302 Laguna Seca on order). The question is should I completely remove the Hicas system but keep the parts for the new owner and replace with a NA system or replace leaking hoses and keep hicas?