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I am wanting baldly to go with a direct port kit. I had a 5117 and it wasn't exactly to my liking, as far as consistency goes. Also with the dp you don't have to jet it as big to get good results.
Good luck.
The #5177 is deffinetly the easiest and cheapest. If you do some post search and find that you want to run a wet kit instead then the NX #20920 is the way to go.