I did something similar ( defintily not as nice as Jim's work) but i blended the corners on my w-2 strip dominator intake and added a 1" HVH spacer and 1/4" wooden under that, then hand blended all the runner edges going down from there. wow was it better all around! Better idle quality, faster throttle response, and when I ran my car on a cool night (70-75*F in FL) , when i would open the hood and check the temps of the runners and headers, that spacer would be sweating with condensation. and the exhaust temps would be better matched! Im a believer!
