difference between 5.0 genesis and r spec genesis

[Ruissimo]

Also to note is that all the 2012 models received larger brakes vs 2009-2011 models.

Correct.

The rear brakes are the same throughout all of the models and years. The front brakes have been upgraded:

• The '12 3.8 got the 13.0" 4-piston brakes from the '09-'11 4.6; it had a single-piston 12.6" previously
• The '12 4.6/5.0/R-Spec got new 13.6" brakes - all models are 4-piston in the front now

There are tons of fun facts, including specs for all models on the official Hyundai News site: http://hyundainews.com/us/en-us/Home/Welcome.aspx

Just search by vehicle

 

[OUsig]

Old thread...my 13 rspec wifth dynomax vt mufflers.
https://youtu.be/fzTc2EQodWY

 

[2012 5.0 R-Spec]

If the gear ratios are different (not just final ratio) then the shift points must be different since the R-Spec gets 1 MPG less than the 5.0.

I'm thinking maybe an intake or fuel injector difference?
If I barley touch the throttle, the car will shift in very low revs, 6th gear at 35 mph but normally, it shifts around 3k. That may be the difference.
I see a 2012 5.0 for sale nearby, I'm tempted to go test drive it. Same color as mine except tan inside