Exactly the question I asked myself over a year ago when I developed this mod.
So, to appease my OCD, I hooked my scangauge fulltime.... logged coolant, intake temps w/ & w/o the relocator.....in standstill traffic jams, up the slopes, twisties & long straights..spiritedly

...during awefully hot days as well. Surprisingly, I never found them to be beyond working temps.
I've had the relocator on a year now & I've never seen 3 digit temps hit this M3 that I've seen in my other cars. I'm amazed at the cooling system & this is a high compression engine!
Had I seen anything alarming, I'd be the 1st to run as far away from this mod.
Look into the bumper, you'll see lotsa room for air. This relocator lets the plate sit way out front free of the bumper lip, too. I believe that helped.
If you compare the M6 lower grille+plate, you'll see there isn't much difference. It may even draw less air by having the plate bolted onto the bumper face.
M6:

M3:

Thanks for the interest, sir, & for bringing up this vital point that was my 1st & foremost concern. I hope I had addressed the question, sir tolits.
