I feel that the sport windshield is about as good for protection in a dusty ride as a baseball cap is for protection in a hurricane.
it didn't seem to help me out any in rain either.
In fact, I'm really not sure what good it does in any conditions, except to look cool.
I think just about any other windshield option would be better.
The windshield I have on my RZR is FANTASTIC, and I can't wait for someone to make one for the ACE.
It's a flip-up windshield with gas struts. It has three positions: Closed, 6 inches open, and full open.
That way I can decide on the fly without even letting up on the gas pedal how much airflow vs. protection I get.
Here is a similar one from EMP for the RZR: RZR Flip Up Windshield
For side mirrors, I kind of designed this setup myself.
First, I ordered a set of cheap bar-end mirrors, here: Amazon.com: Volar M040-Black Universal ATV Motorcycle Bar End Mirror: Automotive
Then I went to Home Depot and picked up a set of conduit hanger clamps for about $1 each, and painted them black.
I also grabbed a sheet of self-adhesive rubber and cut a couple of strips out of it.
Then I took the cylindrical bar end clamps off of the mirrors, ran the bolt through the hole in the conduit clamp and put a locknut on the other side, lined the inside of the clamps with the rubber strips, and wrapped them around the roll cage.
The rubber strips help to keep the conduit in place and protect the finish of the roll cage.
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I did this after looking at the various mirror options and deciding that I wanted low profile mirrors instead of the bulky things I see marketed for UTVs.
They aren't "breakaway" as such, but the rubber does allow for some movement, so I think they will probably not break off on tight trails.
If they do, they are dirt cheap to replace. $9 per side, basically.