ok im looking to buy the fast xfi system like now. i need to know what all stuff do you buy with it. i found a kit that has 3 bar map, xfi to gn harness, and data logging option for 2000. my tuner quoted me 2300 to 2500, thats just for the product not tuning and install. so what all else is needed besides what i stated above, thanks for any help. kinda new to the gn world at the moment