A few years ago I found a way to make a cold side pipe to use from the stock IC to a Greddy TB elbow.

Vibrant performance 2809 aluminum pipe has a 30 degree bend that is just about perfect to go from the stock coupler on the IC outlet to the Greddy elbow. All you have to do is cut each side to length and bead roll the ends or find a metalworker to do it for you. I put the beadroll for the downstream connection (to the stock curved coupler) right at the end of the pipe. Ran this for several years with no pop offs.