Why didnt you just buy a 325i or 335i but opt for the badge removing?
That way, unless they know which model has which exhaust pipes then they wouldnt know.
I personally would never 'downgrade' my car becasue I was concerned about what others would think.
Also. I dont think that increase is remotely possible.....someone correct me if im wrong.
If you're not living on the edge, you're taking up too much space.