hey, erstma hello, am new here {Since the 1.8 75hp is a screwed 90hpler I recommend you: 1. Change camshaft (260° Schrick or one of the Golf2 G60) 2. pure or reprogram the chip. Then you should have a lot of extra power. It is important only that you do not install a shaft with more than 268°! } is it really only enough to convert the nock or are also other kolbel and pleuel needed?! lt?! hope you can help me mfg roland