What he said, my turbo inlet is 4 inch. So I went to bunnings got a 100mm PVC pipe end cap and about 3 inches of 100 mm pipe. Glued them together wile I was there ^^" ... Then drilled a hole and epoxied an air line hose fitting in the end cap. It was a tight fit into the front silicone but it goes on... Used a hose clamp!!! Lol... Then set the reg on the compressor to like 5 psi first. Plug it in and u can hear leaks right away.No other blocking of anything