Shine auto rear diffuser
 

Can anyone vouch for the effectiveness and quality of this product? Is there a noticeable difference when driving? Is their frp good quality or should I spring for the carbon fiber one?

And also the center diverter as well? Would it be much worse without it?

Yes any info would be great in looking at the same kit for my fc looks great but how well does it actually work?

Well it reduce turbulence underneath the car, smoothen the air flow. I can't notice difference at all driving around the freeway. It just looks cool thats why I have it on my car.

+1. Can't say that I noticed a difference in handling with mine other than groups of ppl gathering around the car to look at it :nod:.

Regarding the quality question, are there any fitment issues?

I had to bend and squeeze to get a flush fitment up against the rear fenders which left small gaps right underneath the bumper reflectors. Overall the fitment was pretty decent.

Regarding fitment I'm guessing it's designed to fit directly onto the standard bumper ae so I've got a final konnexion rear kit aat the moment I may need to do some modifying to make it fit nicely

It's functional at speeds of 80mph+.More of the effect is felt when the car has an undertray. In the front and middle. I've gone around turns on the freeway 100mph+ and it feels like the rear is more planted thru the whole turn.