On an 04 Termi with a stock upper and lower right now. If I change the upper to a Metco 2.7"; what size belt would I need?

 

73.5 to 74 inch belt. but you will need a aux idler with that small pulley. in that case you'll need about a 74.5 inch belt. add the other 3 idlers (2 100's and one stock 90mm sizes. you can use a stock size belt (75 inch).

 

^^^ That would be correct!!!!

 

A local guy has an aux idler for 120 with a 100mm pulley. The same guy I bought the unmarried tuner from. 100mm would be fine? Thanks for the input, sorry for the delayed response!