Sell it and buy a skunk2, which is a copy of the itr one. The mocifications needed are much more involved than simply drilling new holes. You'll probably end up spending more trying to rig up an itr manifold than selling the itr manifold and buying a skunk2.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.