Could someone give me the I.D. size of the couplers going between the Y-pipe and the manifolds. I'm installing phenolics under the manifolds as well as a phenolic between the IC and supercharger so I'm thinking the stock couplers will be a little too short. Be nice to have everything on hand at once. Thanks.

 

2 1/4", but i would just buy 2.5" braided couplers 3" long and run t-bolt clamps to eliminate any chance of leaks. Minimal investment well worth the returns in reliability. If you plan on taking the manifolds on/off a few times the stock clamps will eventually strip and not get as tight as you want them.

 

the correct size is 2 3/8" ID

 

Thanks again!