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The part numbers for the 2025 GT Muffler including left resonator and the pipe that connects them is 68616135AB. The pipe and right resonator is 68616136AA.
Another option is the 3.0L G/T Passive Cold End exhaust it was a great option for the 5.7.
There are a few 2025 G/T's showing up at dealers now but I have not heard how they sound yet.
After 4,400 miles my lowest mileage was 16.4 the highest was 19.5 overall being 17.7 mpg hand calculated.
I have a Rebel that has 3.92 gears and 33" A/T tires so it's not mpg friendly.
The 3.0L runs stronger and gets better mileage than my 2023 Laramie with 5.7L , 3.92s with 22" rims.
You can run 87 but if you like to get the most performance from the SO with 22 psi of boost then run premium.
I've had a Challenger Scat Pack and the 392 Hemi used 93 octane so it's no big deal to me.
I've been using 93 octane from the start with combined mileage lately being 16.2 mpg hand calculated although the computer was spot on.
The mileage dropped with Winter blend fuel that switched on 9/15/24 with Summer blend I got 17.4 mpg.
I've gotten this message too "Performance may be limited. Press one pedal at a time" . It's always when doing low speed turns making a turn at a intersection. I guess both the brake and accelerator must have been pressed at the same time...seems odd.
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