View Single Post
      08-02-2018, 11:52 AM   #1
Dazza335iC
Second Lieutenant
54
Rep
215
Posts

Drives: E39 M5, F15 35d
Join Date: Nov 2014
Location: Portland, OR

iTrader: (0)

Garage List
2000 E39 M5 Dinan  [0.00]
2017 X5 35d  [0.00]
Benefits/drawbacks of swirl flap delete?

I'm going to be doing my VCG in a few days, and am tempted to delete the swirl flaps while I'm in there. What are the benefits/drawbacks of this? Obviously BMW put the swirl flaps in there to improve light load efficiency; has anyone who has done this seen a drop in fuel economy? Increase in power (dyno verified)? Or is this just a "I mod my engine because engines mods are cool bro" thing?
Appreciate 0