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Looking back through the thread - we can verify this.

Sorry I may not have explained this properly. The P1 to P2 upgrade cal is part of the upgrade kit, so basically you would be buying the cal to upgrade from a Phase 1 to a Phase 2. Whereas if you have the P1 and we release an updated cal for the P1, then that specific P1 cal would be free.

The P1 - P2 upgrade cal will not be free. However, improvement updates to the existing P1 calibration will continue to be free to those who are running our P1 supercharger kit. Best, Ryan

Hello, Team ROUSH, We appreciate the continued interest in the ROUSH Phase 2 Supercharger upgrade. We just wanted to take a minute to clear up a few things from the above email that was sent to the original poster. The upgraded Phase 1 calibration and Low Temperature Radiator kit upgrades...

I don't believe we've tested a car with 3.55's. You'll have to let us know your results!

Hey Sammy, We were able to hit nearly 130MPH in the quarter mile on several passes. Our cal has been updated since and will most likely be more consistent or even faster with an experienced driver.

Congrats! Yes, the uploader will only allow you to upload the most up-to-date calibration when tuning a vehicle for the first time.

Hey guys, Here's a quick video of the ROUSH test car running the 10.86 pass at Milan Dragway. This car is full weight with our phase 1 calibration. Only change is a slick on the rear mounted on an 18" wheel.

The update doesn't give the vehicle more power, but allows it to use the power it does make more efficiently.

There is an update for the older 2018+ kits. You'll have to visit a Ford dealer to check your calibration ID to verify if it needs updating or not.

Hey Keith, The ROUSH decklid panel is only available on serialized ROUSH Mustangs built in Michigan at ROUSH HQ.

This is the calibration that comes with our retail kit. To ensure you have the latest version give us a call at 800-59-ROUSH and option to the customer service line.

Last week the ROUSH engineering team took a test car to Milan Dragway and ran a 10.86 second pass in the 1/4 mile on a vehicle that still maintains a 3-year/36,000 Mile warranty. 2018 ROUSH Supercharged Mustang 10-Speed Automatic trans Stock ROUSH Phase 1 Calibration 18" Drag Radials...

Hey David, Thanks for considering the ROUSH blower for your 2018! If you have any specific questions, feel free to shoot me a message and I can help you out. Best. Marcus

This is still the most current version I have. If I get anything else I will be sure to post it! Glad to have you on #TeamROUSH!

The 2018 ROUSH Chin spoiler does improve downforce. When we first made the product and we're putting it to the test, we found it required more secure mounting brackets since it created much more downforce. I would highly recommend the ROUSH lower grille when installing the splitter as it is...

The RS2 maintains the factory Ford calibration. So tuning would be the same process as tuning a standard Mustang GT.

The 2018 ROUSH Chin spoiler does improve downforce. When we first made the product and we're putting it to the test, we found it required more secure mounting brackets since it created much more downforce. I would highly recommend the ROUSH lower grille when installing the splitter as it is...

There are nearly the same motors ford usese with different electronics controlling the valves.