They call it 550hp package but is it. They use a tapered bore spacer an smaller TB. Then opened ducts and ad more spoiler. So in essence with these changes the car drives and produces lap times as if it only has 550hp. The engine is probably still making 600-625 or even a little more. Would have liked to scene Nascar. Square the engine to 3.85 x 3.85 9.0 on Comp. Limit intake valve to 2.02 and cam lift to say .575 RPM limit of 8000. Use a 5spd for OD on superspeedways. Limit the final gear ratio but let them change gearbox ratios. Then start putting drag on the car and restrictor plates. To adjust for what speeds they want at tracks. They talk about changes save the teams money. That's BS Hendrick TRD Penske Yates are spending just as much now as ever before. Per dollar to HP thats just what they do. Just like the ECUs they hand out at each race. Look at the final race for say the last 5-7yrs. What the hell is the odds that the 4 drivers in championship are always in the top 4-5 at the last race. When all year long they are scatter 1-15 positions at any given race all year long. They are giving the 4 cars in the final something that the other cars aren't getting.