[Bailey238]

Hi all,
I have an n54 135i currently on an mhd stage 1 tune. I know these cars have issues with carbon build up and I'm reading that methanol injection can help with this. My question is, would adding a cheap universal meth kit help clean my valves and as a bonus give me a slight performance boost on the same tune all without any added risk? My friend says if I didn't change the tune there would be no risk since if meth stopped flowing it would be on the same tune it is now. Would I even be able to notice any performance gains without a more aggressive tune? My thought is basically I could spend $400 now on meth and get a little performance boost or spend $400 later on carbon cleaning. What do you guys recommend?
Thanks in advance!