Drain oil. loosen ac pump, pull ac belt. remove lower charge pipe. drop pan. 4 bolts remove balance shaft assy. Install BSD. Scrape old silicone off pan (this is the hardest part. and its not hard). Re-silicone. Bolt up pan, put the AC compressor and belt back on. reinstall charge pipe. Refill oil. Go to BK and get a DOUBLE whopper this time cuz u just got TWICE AS BAD ASS.