https://www.s2ki.com/forums/index.php?showt...&#entry11121447

tunerjetta29's yellow s2k is what i'm referring to

 

Isn't that ASM?
Or OEM that he cut himself?

 

he already answered you. it's an AP1 bumper he cut himself.

 

It's the factory AP1 rear cut.

ASM has holes that are smaller and a single exhaust exit

 

oh, okay. Thanks. I was wondering what are the practical applications of having openings in the rear bumper? rear brake cooling and heat dissipation? Internal Aerodynamics? Because the asm, j's racing type s, and many other s2000 aftermarket bumpers have these outlets

 

The rear vents decrease drag by releasing the air that gets trapped in the rear bumper at high speeds. But like most street cars, its just to look different

 

I believe the theory is that the rear bumper acts like a parachute. The holes are there to aleveate drag ... I saw a topic on here once that covered this.

 

if you could find the link, it would be much appreciated.

 

Check here:

Link

Search is your friend

 

This is the one I was really looking for though ... hope it helps

Cut AP1 Rear Bumper (ASM style)