what will break first?

okay so i was originally planning on a turbo setup but due to money needing a wideband to tune x'd that out. anyways assuming i spray about a 125 wet shot on my m6 what internally would be the first to go assuming i dont have any knock and my air/fuel is right. will my air fuel be close with a mail order tune? ive also heard the pistons are the weak link but it sounds like they handle 125hp okay? what about bearings? not planning on spinning above 6k. o yeah im probably going to put in a 255lh tank pump too. sorry so many questions but anyhelp is appreciated. thanks
andrew

Your clutch.

After the clutch it would be your stock rearend if you put sticky tires on it.

the tranny mounts

the tranny mounts

Why would they go out?

Why would they go out?
within a week of spraying mine broke. definitely going to need poly mounts. I have an A4. :)

A M6 is not hard on the tranny mount.