(5) 3-Ply strong silicone couplers (11) Stainless T bolt Clamps 2.5" (1) Stainless Turbo T bolt clamp 2" (1) Turbo/IC 4 Ply Silicone Pipe Reducer 2" - 2.5" Ok get this, these couplers have a freakn warranty if you buy this kit! If they bust, tear or whatever (no longer can be used to serve its purpose) we will replace it for you, just send the damaged unit and $5.00 to us and we ship back within the 48 states. You must include a copy of your invoice! Keep in mind if the end of your intercooler pipe is sharp you may want to dull it with a wire wheel or like to keep from cutting into the coupler. These stand up to 350 degrees easy and 150psi They can strech a bit to go over say a 2.75" Precision intercooler end or just fit tight over a stock honda B16 throttle body of 67mm. Now something like the K20 RSX with a 72mm OD TB will need the 2.75 coupler/clamp. Then most turbos are 2" oulet on the compressor. If you have a S or SP cover you need a 2.5 coupler there so pick that since the compressor outlet is 2.5"