These CNC ICV elbows replaces your stock ICV elbow. The original elbow is press fit from factory and loosens over time. Once loose, you end up getting a vacuum leak and up until these there was no great way to solve the problem. Most people either try a glob of JB weld or silicone; eventually fail again and cause risk of material ingestion. The CNC units use two viton orings to produce a reliable and serviceable seal. Initially made one for my own use, and many asked that I do a larger run; and I have, 100 units to be exact, once sold through I’m unlikely to be making anymore, so grab one now if you want one. Price: $100 + $8 shipping globally via small packet air.     Booster side elbows here: CNC Throttle Body Booster Side Elbows – Fix for vacuum leak E30 M20 engines   Here for all 3 elbows (one shipping charge): Here for 1 ICV elbow and 1 TB side elbow  [For late E30’s with only 1 TB side elbow and one shipping charge):