I need help with aerodynamic questions
 

I have a shipment of a oem ap1 spoiler coming in. Is it a good idea to put on both a spoiler under the wing? I have mixed reviews of a spoiler decreasing the amount of drag that is applied but it may not be functional having both a wing and a spoiler. But in theory it worked insanely well for the 911 porsches and have not failed to amaze. I am pretty sure the same concept can be applied to the s2000. Can someone verify?

The Evasive V.2 Time Attack S2000 uses what looks to be an ASM spoiler and a Voltex wing. They don't half ass anything, so I'd imagine if there aren't any real benefits, there at least aren't any real drawbacks either. I say go for it.

The Evasive Voltex car uses a ducktail spoiler similar in design to the JDP spoiler. But theirs is made by a company called K1. It's supposedly proven in a wind tunnel to reduce drag and increase the efficiency of a higher mounted wing.