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Hate to burst your bubble, but even the ZR-1 has lift at speeds.
If your looking for negative numbers in lift, in a store bought package, then Katach has a package that will get you around 50lbs front/75 back @ 125mph.
That's the Ron Fellows Spoiler. And if you want real down force you have to go with a big ol' wing. There's a Black GS that posts on here that actually looks pretty mean with it.
take a look here. This doesn't how your spoiler in the test but it gives good info. I believe your spoiler does have added downforce, just not as much as the katech model as it is quite tall for a spoiler.
Like I asked, how fast do you want to go? If you are only driving it to the movies, what you have is great! If you have 1000HP and take it to the track, you want an APR Wing.
Like I asked, how fast do you want to go? If you are only driving it to the movies, what you have is great! If you have 1000HP and take it to the track, you want an APR Wing.