I have the Big Brake package on my 2015 Denali. Word of warning. No one told me this when I ordered them or after having them installed. Your spare tire will not fit Over the Brembos . GM answer, (I found out the hard way! ) is to do a 2 tire change if the flat is in the front. So they even put out a service notice. Swap out the rear tire 1st with spare and take back tire to replace the front flat. I tried putting a 20in spare underneath but won’t fit as it’s molded for an 18. 20in is the smallest rim to fit over them. If I had known this not sure if I would have gotten them. Just a word of warning!
I wanted to post something positive after not liking the GM perf. exhaust, overrated and a pass imo.
The Brembo brakes on the other hand, BUY them if you like pedal feel or are coming from a German car. I feel everything they quote in the release - 42% larger, 16.1 rotors, 84 percent increase in brake pad area, 31 percent reduction in pedal force and 12 percent reduction in pedal. Imo, well worth the money.
For me, I felt the stock brake pedal was mushy, especially on hard braking - how hard do I need to push to get some feedback or get it to stop? They never gave me confidence.
When bedding the rotors/pads today, they actually overpowered the tires and locked them up a little which is the feeling I would prefer. The stock brakes could never overpower the tires which is sad because the tires are made for a mileage goal and road noise (imo), thus not the stickiest compound available. The downside to the brakes, now I want to show them off and look for a new tire/wheel combo. Very happy with this addition. Yes, they are expensive but it is something I felt the first time I pressed the brake pedal.