Here are some pics of the custom mid-length 1 3/4" with 2.5" collector headers. Not much to look at especially all dirty but they allowed me to run a best of 12.59 with them along with a ADM Race CAI and tune.
After trying the ARH's the headers were switched to 1 3/4" with 3" collector. I have managed a best of 12.09 with the addition of the cam, heads, intake etc.