Image Credit: Cars & Bids.Chrysler never gave the second-generation 300 the full Hellcat treatment. Despite sharing plenty of DNA with Dodge's Charger, the big sedan bowed out without ever receiving the supercharged 6.2-liter V8 that turned its corporate cousins into tire-smoking monsters.Naturally, that hasn't stopped enthusiasts from building what Chrysler wouldn't. Engine swaps have created a handful of unofficial Hellcat-powered 300s over the years, combining the sedan's understated shape with the kind of power normally accompanied by Dodge badges.One particularly comprehensive example has now appeared for sale. It started life as an ordinary 2012 Chrysler 300 Limited, although very little about its current specification could still be described as ordinary.AdvertisementAdvertisementThe transformation extends well beyond dropping a huge engine under the hood. Hellcat hardware has found its way into the drivetrain and cabin, while upgraded suspension, brakes, and extensive cosmetic modifications complete what amounts to a home-brewed 300 SRT Hellcat.There's A 707-HP Hellcat V8 Under The HoodImage Credit: Cars & Bids.The original 3.6-liter Pentastar V6 is long gone. In its place sits a supercharged 6.2-liter Hemi V8 sourced from a 2020 Dodge Charger SRT Hellcat, rated at 707 horsepower and 650 lb-ft of torque.The donor Charger also supplied its eight-speed automatic transmission, with all that power sent exclusively to the Chrysler's rear wheels. A Legmaker air intake and JXB Performance driveshaft carrier are among the additional drivetrain modifications reported by the seller.There's no verified acceleration figure for this particular build, so comparisons with a factory Charger Hellcat would be speculative. Still, putting 707 horsepower into a rear-wheel-drive Chrysler 300 should provide considerably more excitement than the V6 originally installed at the factory.It Received Plenty Of Other Performance UpgradesImage Credit: Cars & Bids.Adding Hellcat power without touching the rest of the chassis wouldn't exactly be ideal, and this 300 has received several supporting upgrades. Eibach lowering springs bring the body closer to the pavement, while Brembo brake calipers provide additional stopping hardware.AdvertisementAdvertisementThe car rides on 20-inch SRT Trackhawk-style wheels and has received an SRT-inspired front fascia. There's also an aftermarket vented hood with a prominent scoop, aftermarket headlights, LED taillights, black mirror caps, and a rear spoiler.Its original paint is silver, although you won't see much of it at the moment. The body is covered by a Gloss Desert Storm vinyl wrap that gives the sedan a considerably more aggressive appearance.Some cosmetic imperfections are disclosed. The auction listing notes scratches on the wheels and a tear in the front bumper's vinyl trim.The Hellcat Transformation Continues InsideImage Credit: Cars & Bids.Opening the doors reveals that the donor-car influence didn't stop with the powertrain. SRT Hellcat-sourced black Laguna leather seats and matching door panels have been installed, along with an SRT steering wheel.AdvertisementAdvertisementThe 300 also uses a Hellcat instrument cluster and a newer Uconnect infotainment system offering Apple CarPlay capability. A smartphone-controlled kill switch is another addition, while factory equipment includes automatic climate control, an Alpine sound system, and cruise control.There are signs of use inside, including creasing on the seats and wear on the steering wheel. Those details are worth considering alongside the car's unusual mileage situation.Cars & Bids lists the Chrysler as True Mileage Unknown because its replacement Hellcat instrument cluster displays the donor vehicle's mileage. The cluster currently shows approximately 54,000 miles, while Carfax recorded 187,450 miles on the Chrysler in July 2026.There Are A Few Important CatchesCarfax also reports several incidents in the 300's history. Minor damage was recorded in March and July 2023, while another rear-end collision resulting in reported minor rear damage occurred in August 2026.AdvertisementAdvertisementPotential buyers will also need to investigate whether the extensive modifications comply with their state's regulations. The seller specifically warns that the car may not pass emissions testing in some states.The current owner reportedly purchased it in July 2026 and has driven it approximately 3,000 miles since. It carries a clean Florida title and comes with two keys and the owner's manual.Now The Hellcat-Swapped 300 Is Up For AuctionThe heavily modified Chrysler is currently being offered on Cars & Bids, with the auction scheduled to end on September 2. At the time reflected in the supplied listing, bidding had reached $8,000 with five days remaining.There's still plenty for prospective buyers to investigate, particularly the true mileage, accident history, emissions compliance, and quality of the extensive conversion. A heavily modified 14-year-old sedan with 707 horsepower isn't exactly a purchase to make without a thorough inspection.AdvertisementAdvertisementStill, there's something undeniably appealing about the concept. Chrysler never built the second-generation 300 Hellcat that enthusiasts wanted, so somebody went ahead and assembled one using many of the ingredients that made the Charger SRT Hellcat such a riot.If you want more stories like this, follow Guessing Headlights on Yahoo so you don't miss what's coming next.