you want to use a die grinder to port out the manifold... you can buy the kit from summit for about 25 bux shipped....

i used all but 4 peices in the kit (it comes w/about 40 peices)..

the die grinder can spin a lot faster cuz its air powered...

and it took a good 3 days, about 6 total hours to get it done properly... (the whole manifold minus the top inside portion of the upper manifold)...

a dremel would take days, and about 20 of each of the things posted above to do properly...

good luck either way..

i know from experience cuz i did one for wtngclan and listen to him ;-)