...the silicone couplings like those that would normally come in a supercharger kit, from someone who knows how to measure? I need one from the discharge off the supercharger and the one that attaches from the discharge tube to the throttle body and don't feel like paying Summit's $15-20 a piece prices. I ordered a 2 3/4" and 3" coupling off of eBay and they sent me two of the wrong size, so needless to say they're going back and I'm getting them elsewhere now.