259hp 163tq roughly 2150 eg6 chassis. big bore gsr. 11.8 @111mph

 

I prefer stock, but if I had to choose I find the Carbon "Diffusers" aka Holes in the rear bumper to be far more attractive than some flaps cut into the bumper, I cant see those 2 little windows doing much but the large holes IMO will do something.

 

that et and mph are both off for that power and weight.

Bumper flaps are nothing new, i have had them for a while and funny car has been using them for what seems like forever. If you look at Tony's bumper you will see alot is cut off the bottom of it. Its not just the flaps. I didnt cut any of my bumper just 2 windows to release some air back there and thats all. I personally hate the metal plates with the holes in them.

 

Yup funny cars have the flaps where the brake lights are,( break light stickers)