I have an 87 911 with 230,000 last rebuilt about 95,000 ago and I anticipate another rebuild coming up. I do not know if I have Nikisil cylinders so will assume that I will have to replace the pistons and cylinders. I saw a listing on ebay for a 3.6L upgrade kit of new Biral cylinders with new forged pistons with rings and choice of compression ratios for less than $3000. Why buy Mahles 3.2 replacement sets for more money? Any insight? buy the way the outfits name selling this upgrade is Motor Meister, whom I understand does not have the best reputation.