Here's some additional information on where I purchased everything: I'm not affiliated with any company.

Car Universal Front Bumper Lip Body Kit Spoiler For Dodge Challenger Charger

86.6'' Side Skirts Rocker Panel Lip Splitter For Dodge Charger RT SRT SXT 15-20

For Dodge Charger 2015-2020 Replace CH1195133 Rear Lower Bumper Valance

AMAZON.COM
Dynomax 24250 Race Bullet Mini Muffler

AMAZON.COM
Rear Bumper Diffuser Universal Car Side Fender Skirt Lip Splitter Canard Protector 1 Pair Carbon Fiber/Black (Black) Modification may be required.

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