Generally, a red DI means 130 bhp, full red TDI means 150, Not certain on just the red I.
But, it seams to have been left up to the VW dealer what badge was stuck on so its only a guide. Best way is to check the data sticker under the boot carpet (LHS) it will give you the Kw rating of the engine.
Eg 96KW is the 130 bhp model.