So i cant decide between the APR rear diffuser and the JDM rear bumper with a voltex diffuser. Does any one have any idea which one is more effective? Honestly more then anything else that is what it comes down to for me. Opinions or insights any one?

 

I wouldn't know about the effectiveness but the JDM and Voltex Diffuser combo is siccccccccccccckkkkkkkkkkk

 

I picked up one of the first APR rear diffusers sold and find it very effective on the track. It was first installed on a 2005 MR that I did many HPDE track days with. My track of choice is VIR (Virginia International Raceway). Onn the front straight the speeds get quite high and you will often watch the Corvettes get a little unsettled as they take the slight bend on the front straight as there is a slight hump in the track surface. The Evo would just stay planted to the track. The APR design goes quite a way under the chassis so that it develops an excellent air flow that produces the desirable down force that keeps the tires in contact. The design makes it difficult for air to get trapped behind the rear bumper cover too.