That is why I went with the AWEs. Contrary to popular belief they are not hard to install and look OEM at about half the cost; however, the Blackmills seem to work a tad bit better so track rats may find them a smidge more useful.

 

Finally had a chance to drive on the freeway today. Very pleased with performance of the Blackmill. I generally drive with my driver's side window open, and this really works! Amazing that this little winglet can prevent all that buffeting . I'd be interested to see the aerodynamics of how it works. Highly recommended.

I prolly won't install the passenger side one. Anyone want to buy it?

 

What I don't understand is why Porsche didn't design this functionality into their cars in the first place. It would be nothing, nothing for them to do it.

 

To gain speed, this system causes a loss of between 2 and 5km/h

 

I would not be surprised as they use a wind tunnel; however, the loss of speed without them is minuscule.

 

I put mine on recently, seems like the passenger side is having a tough time staying on.

I've noticed after a 700mile drive at speed the front side started lifting ever so slowly, I removed and re-placed it, but I'm somewhat concerned on whether it'll become a projectile at the worst time on track.

Any suggestions on making the 3m sticker stick well again?

 

Replace it - you can buy a roll of 3M tape on Amazon for less than $10. Heat the old with a hairdryer, remove and clean both surfaces with alcohol before cutting/applying a new piece.

 

Thank you, makes sense. I'll have the tape by Thursday, I should be able to fix it before car sees track work Friday

 

I really like the look of these, and they seem more functional than the AWE ones.
https://shop.gmgracing.com/collectio...w-air-diffuser

If they offered a matte black version I would have bought them, but since they don't I ended up with the AWE ones...

 

delete

 

I had the same thought after seeing them on another car at the track. They seem a little bigger than the AWE ones and likely work a little better. But CF only and $700? HELL NO!!!

 

i also went w/ the AWEs!

 

How effective these diffusers are on a Targa 991.2? This is my daily drive car and 50% of time my roof is down with both windows up.

 

You will notice the most benefit with the top up and driver's side window down. I have a Targa as well and usually drive with the top down and windows up as well but once in while I put the window down and it helps so the small cost and OEM look of the AWEs convinced me.

 

Same here. We’ve only had a few days of warm weather so have barely driven the car with the windows down and top down. With the window wide open, there is some blowing on the seatbelt that goes away with the window up an inch or two and I hope the AWE product will have the same benefit as having the windows up a touch. I expect to receive my order next week so plan to install them when back from a trip at the end of the week.