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You should warn others now by telling everyone the name of the dealer and name of the 3rd party warranty.

Here ya go: 1. 3.73 and 275/40R19 were the stock ratio/tire size 2. When Roush added the Stage 3 package to my car, the tires were changed to 275/35R20...about 1/4" smaller circumference than the stock wheels 3. See #2 above...with this small of a change I had no driveability issues/power...

Just tire size. Maybe try only that change, then PCM relearn and see what you get...leave gear ratio unchanged.

So my speedo would be accurate, I changed the settings, thru FORScan, when I changed tire size. I had the same bog-down/no power in 4th gear as OP and Wolverine are talking about...I did the PCM relearn and codes were cleared and I had full power again. It appears there may be other issues.

Have you accomplished the PCM re-learn procedure in FORScan?

What does your paperwork from the dealer say?

You can buy the plans online from a couple of Ford dealers at a much better price than you can usually get from your local dealer. Here’s one dealer: http://www.zeiglerfordesp.com/?gclid=EAIaIQobChMIh8bA7Pqp3gIVhIWzCh3cdw30EAAYAiAAEgLlMfD_BwE

Look here: https://fordprotect.ford.com/extended-service-plan

@Marcus@ROUSH Any updates to the 2016 or 2017 color/package breakout? Thanks for looking into this for us Roush Owners.

Search on this Forum about using FORScan and you’ll find a couple of threads about making changes to your vehicle...then look at the thread below. Here is a thread about what changes we’ve been able to make so far: https://www.mustang6g.com/forums/threads/forscan-codes-s550-mustangs.98260/

Nearly impossible to see from inside the car...but great for others to see, especially those in the lanes next to you as you signal a lane change.

What it looks like when both illuminate while pressing unlock on the FOB.

Yep...I had them on my 15 and they are fairly easy to install. They look good from the outside. I even tinted mine very slightly to dull the white look.

I didn't notice your sig line before...but not all 2016+ have the temp sensor, correct? Just the 2016+ with the Performance Pack/Torsen.

Which line(s) and which Module did you try to change?

Do you actually have the rear diff temperature sensor? If not, then it won't matter what you have enabled.

Great color! But do you actually do any work in that garage...look too clean :)

I looked up the 2016 Roush production numbers and the color/package breakout is the same as the 2017 numbers you posted. Is Roush no longer giving a more detailed breakout of production combinations? Thanks.

Thanks for posting this info. Is there any update as to stripe combinations as Roush has done in previous year production numbers? PS - I'm really enjoying my 2017 RS3 :)

+1...usually don't hear them until inside my garage...plus I would think if your fans weren't working you would definitely overheat.