35d sounds like I have a bov now???

[Grunt]

I just did a stage1 DUDMD tune on the wife's 2010 35d. Life was great then the maf sensor died. FCPEuro to the rescue and it runs like a champ now.

Although the car is running better and stronger and with better mileage than it ever has, when I shift at higher rpm's in manual mode now, it sounds like I have little blow off valve. The sound is about 25% of what my Tial bov sounds like in my 335 in noise for comparison. I'm guessing there has to be a leak somewhere. Anyone have this before and can give some guidance on where to start looking before I start tearing everything apart this weekend.

Also, I'm getting zero codes on Protool.

Thanks