1970 Plymouth Road Runner Superbird Start Up, Exhaust, and In Depth Review

This 1970 Plymouth Superbird was built to win NASCAR races, not just look fast — but the detail everyone remembers is the horn, which plays an actual “meep meep” straight out of the Road Runner cartoon. Between the original $4,794.62 window sticker and the aerodynamics NASCAR forced onto the design, this in-depth walkaround finds a lot more than a gimmick. Watch to hear the horn for yourself.

Somewhere between a race car and a cartoon character, Plymouth built one of the strangest and most extreme muscle cars America has ever produced. It has a nose cone that stretches 19 inches beyond a standard Road Runner, a wing tall enough to clear the trunk lid by design rather than accident, and a horn that does something almost nobody expects the first time they hear it. This particular example gets the full walkaround treatment — start up, exhaust note, interior features, the works — from a reviewer known for treating every car with equal reverence. But it’s one small detail, buried a couple minutes into the video, that turns out to be the most memorable part of the whole thing.

The Horn That Gives the Car Its Name

At roughly the two-minute mark, the review reveals a detail that even seasoned Mopar fans sometimes forget: press the horn on a genuine Road Runner and it doesn’t honk like a normal car, it produces an actual “meep meep” sound licensed from Warner Bros., matching the Road Runner cartoon character the model was named after. It’s a small, almost gimmicky touch, but it’s also a reminder of just how directly Plymouth leaned into pop culture marketing to sell what was otherwise a deadly serious performance package aimed at drag strip buyers on a budget.

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A Window Sticker Price That Tells Its Own Story

According to the original window sticker documented in this video, this Superbird sold new for $4,794.62 in 1970 — a figure that seems almost quaint today but represented a genuine premium over a standard Road Runner at the time, largely due to the aerodynamic nose cone, the massive rear wing, and the homologation-driven engineering required to make NASCAR’s top speeds survivable. That price bought a car built for one very specific job: qualify Plymouth for high-speed NASCAR competition by selling enough street versions to meet homologation rules, a requirement that shaped nearly every design decision on the car.

Why the Nose Cone and Wing Weren’t for Show

Unlike later generations of muscle cars that added wings and scoops purely for visual aggression, the Superbird’s aerodynamic package existed because NASCAR forced the issue. Richard Petty and other Plymouth drivers needed a car that could handle sustained speeds above 200 mph on NASCAR’s fastest superspeedways without the front end lifting or the rear end getting light, and the nose cone plus the tall rear wing were the engineering solution, not a styling exercise. Every Road Runner-based Superbird sold to the public exists because Plymouth needed 1,920 street examples built to satisfy homologation rules for the 1970 season, a number small enough that surviving cars remain genuinely rare more than fifty years later.

Under the Hood: Engine Options That Meant Business

Buyers could order a Superbird with a 440 cubic-inch V8 in either four-barrel or Six Barrel carburetion, or step up to the legendary 426 Hemi for maximum output and NASCAR-adjacent bragging rights, though the Hemi option added significant cost and was ordered far less often. That range of engine choices meant the Superbird could be built as a genuinely brutal street car even without the top option, which is part of why surviving examples with any of the three engine configurations — 440 four-barrel, 440 Six Barrel, or 426 Hemi — now command serious money at auction, regardless of which powerplant sits between the fenders.

A Presenter Known for Treating Every Car the Same

This review comes from Saabkyle04, a channel built around giving viewers the closest thing to an in-person dealership walkaround for cars ranging from everyday commuters to seven-figure exotics, all delivered with the same methodical, detail-first presentation style. That consistency matters here: a car this outlandish could easily get reduced to a highlight reel of its wildest features, but the full-review format means viewers also get the fuel economy figures, the interior ergonomics, and the mundane details that get lost in most Superbird coverage focused purely on the wing and the nose.

Why the Superbird Still Divides Muscle Car Fans

Even decades later, the Superbird remains one of the most polarizing designs in muscle car history — some fans consider it the ultimate expression of function-driven design, while others still find the nose cone and wing genuinely bizarre next to cleaner-looking contemporaries like the standard Road Runner or a Hemi Cuda. That divide hasn’t hurt values; if anything, the car’s unmistakable silhouette has made it one of the most recognizable and sought-after Mopars of the entire muscle car era, precisely because nothing else on the road looks remotely like it, then or now.

A Cartoon Namesake for a Genuinely Serious Machine

It’s easy to focus on the horn gimmick and the Looney Tunes branding and miss what the Superbird actually represents: one of the most purpose-built, engineering-driven muscle cars Detroit ever put into production, built specifically to win NASCAR races rather than just look fast in a parking lot. That combination of cartoon marketing wrapped around genuinely serious aerodynamic engineering is exactly what keeps this car fascinating more than fifty years later, and exactly what this walkaround captures better than a spec sheet ever could.
That kind of licensing arrangement — an automaker paying to put a cartoon sound effect behind the wheel of a genuine performance car — would be almost unthinkable in today’s more cautious corporate environment, which makes the surviving detail feel even more like a relic of a specific, more freewheeling era in Detroit marketing. It also means every Superbird owner gets to relive that gag decades after the fact, a novelty that has aged into a genuine point of pride rather than the throwaway gimmick it may have seemed like on the showroom floor in 1970.
Fifty-plus years on, that combination of engineering seriousness and cartoon-branded showmanship is exactly why the Superbird still gets a full, careful walkaround treatment rather than a quick highlight reel — there’s simply more going on beneath the wing than a single clip could ever capture.

A half-century of hindsight has only made that combination more impressive, not less.

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