It's not just 2 cylinders, it's all the associated mass that goes along with it and the decrease/change in crumple zone because of a larger engine. Perhaps it is just fine, perhaps they didn't want to pay previously to certify the chassis for V8. Who knows for certainEmissions are bullshit anyway, so I could give a shit about the EPA or emissions testing. And yes, I care about the environment, but global warming is bullshit...Let's just be real and honest about it.
As for crash tests...It's already passed crash testing as a vehicle...It's in production for over a year now. Slapping 2 extra cylinders on an engine should not cause it to fail a crash test...Unless the vehicle was complete garbage to begin with... In which case, I'm sure as long as Jeeps have been around, and other than the JK with their well-known flaws, the Jeep Wrangler (as a whole) has been known as a very reliable and well-built vehicle.
Just personal thoughts, but I don't think that 2 extra cylinders should make that big of a difference... Now, the 200 extra HP and lbs.ft. of torque WOULD make a difference on how fast and hard you hit the wall, or another vehicle, but that would be on the driver's stupidity, not the crash-test capabilities. I mean, the 707HP Hellcat is legal in a Charger, and most of that car is made from recycled Rubbermade containers. But then again if they test it at the same speeds, theoretically it shouldn't make a difference on how many cylinders, or how much power it has.