If you had to take a wild guess at which Hollywood celebrity had a custom-built 1966 Mustang convertible extensively fitted with ex-NASCAR gear and a variety of other track-worthy upgrades back in 2006 it would be a tough ask. Sylvester Stallone perhaps or maybe even Steven Seagal, you probably wouldn’t have picked wild man Charlie Sheen but that’s who is responsible for this automotive gem.

The Mustang is no longer owned by Sheen but is on sale in a charity auction and is expected to raise some serious coin. The auction page claims it would cost US$300,000 to build a car like this and while that seems high, the modifications (view below) are very extensive.

Under the bonnet lies a 358-cubic-inch Winston Cup engine, there’s huge Wilwood brakes and a fully upgraded suspension set-up. This Mustang is geared up for some winning.

The auction runs through to November 17 on an American website, click here to check it out. The bidding is currently at US$105,000 and its expected to push much higher.

View the full specifications below and images in the gallery. Charlie Sheen – who would have thought.

1966 Mustang Convertible – Specifications

Drivetrain & brakes:
Nascar 358 Cubic Inch Winston Cup Engine
750 CFM Holley Vacum Secondary Carburetor
Approximately 650 Horsepower
Custom stainless steel headers and 3 inch exhaust system
Complete Weaver Brothers custom dry sump oiling system
Custom braided steel lines for fuel and oil throughout the vehicle
Custom radiator
Custom heavy duty oil cooler
Richmond 6-speed transmission with scattershield
Tilton style Nascar type hydraulic clutch
Custom Moroso dual breather tanks
Alternator mounted next to the driveshaft and driven by the driveshaft
Battery mounted in the trunk
MSD ignition system
Electric fan thermostatically controlled
4-Wheel Wilwood 4-piston caliper disc brakes
Dual Wilwood 4-piston master cylinders

Suspension:
Custom Nascar type rollcage from engine compartment to trunk of the vehicle
Nascar type adjustable coil-cover shocks
Tubular front suspension
Shortened Speedway 9-inch Ford Detroit locker rear-end
Nascar Speedway wheel hubs
225/50R15 Front tires and 275/50R15 Rear tires

Interior:
Custom black racing style interior
Nascar type breakaway steering wheel
Black butler racing driver and front passenger seats
Black 5-point racing seatbelts
Custom black leather rear speedster cover
Black carpet with red borders
Custom black leather door panels with red stitching
Power windows
Custom electrical dash panel
Custom dash with 6-gauge dash instrument cluster

Exterior:
Red exterior
Black Lemans style center stripes and Boss 429 type hood scoop
All exterior chrome trim pieces/emblems/bumpers and stainless trim pieces were powdercoated black