Chrysler 300C Hellcat Conversion: Ultimate Demon-Powered Sleeper

The Allure of Unconventional Power

What if luxury met unhinged horsepower? That's exactly what happens when a Chrysler 300C receives a Dodge Demon heart transplant. After analyzing this build, I believe it represents the pinnacle of passion projects – combining Mopar's forgotten flagship with SRT's most brutal powertrain. The owner's journey from a previous 5.7L build to this fire-breathing 6.2L monster demonstrates real-world expertise gained through trial and error. That supercharger whine isn't just noise; it's mechanical symphony that rewires your dopamine receptors.

Chapter 1: Engineering the Impossible

This isn't a bolt-on kit – it's a full organ transplant. The builder sourced every critical component from a wrecked Charger Hellcat Redeye:

• The 6.2L HEMI Demon engine with its massive 2.7L supercharger (larger than standard Hellcat units)
• ZF 8HP90 transmission built for 700+ lb-ft torque
• Complete Hellcat rear differential and driveshaft
• Brembo brake system with 6-piston front calipers

What makes this exceptional? The builder addressed Chrysler's baffling decision to never factory-offer a 300C Hellcat. As noted in Stellantis' internal documents, platform sharing limitations originally prevented this configuration – making such swaps both mechanically complex and emotionally compelling.

Chapter 2: Beyond the Factory Blueprint

The real magic happens in the supporting modifications that transform transplanted organs into a cohesive organism:

Power Adders

• Kong 108mm throttle body with custom spacer
• DSX flex fuel kit supporting E85 mixtures
• 1050cc injectors and dual fuel pumps
• Water-methanol injection combating heat soak
• Forged pistons/rods (critical for 1000hp reliability)

Cooling & Efficiency

• Custom hood venting mimicking Demon aerodynamics
• 180° thermostat for lower operating temps
• Supercharger spacers improving airflow
• Carbon fiber intake system

Pro Tip: Always upgrade fuel systems BEFORE adding boost. This builder learned from his previous 5.7L project where fuel starvation caused detonation.

Chapter 3: The Sleeper Aesthetic

Don't mistake restraint for lack of passion. Externally, only subtle clues hint at the chaos within:

• Demon-style hood extractor
• "Demon" badging on fenders
• Satin black factory wheels

Inside, the balance shifts toward drama:

• Alcantara-wrapped steering wheel
• Custom carbon fiber shift paddles
• Hellcat gauge cluster integration
• Red-stitched seats with embroidered logos

The genius? Maintaining the 300C's executive presence while delivering Hellcat theatrics. It's the automotive equivalent of a tailored suit hiding battle armor.

Build Your Own: Critical Considerations

Thinking of attempting this? Here's your reality check:

1. Budget $25k+ for parts alone (engine/trans/diff)
2. Source a running donor Hellcat – salvage titles cut costs
3. Upgrade drivetrain mounts – factory 300C bushings fail
4. Custom wiring harness is mandatory (not plug-and-play)
5. Tuning requires specialists – HPTuners alone won't suffice

Recommended Shops:

• Speedlogix (Hellcat specialists)
• Modern Muscle Performance (tuning experts)
• Dusterhoff Racing (transmission builders)

The Mechanical Symphony

Hearing that supercharger wail through a Chrysler's dual exhaust creates cognitive dissonance in the best possible way. This build proves that with enough technical skill and perseverance, you can create what manufacturers won't. The 1000hp luxury sedan isn't just fast – it's an emotional reset button reminding us why we love cars.

What modification would push YOUR daily driver into dream car territory? Share your project ideas below!