If you’re a fan of the heavyweight boxers of the 1970s, then you know all about “The Fight.”

That was the epic first battle between all-time greats Muhammad Ali and Joe Frazier, which Frazier won by unanimous decision in 15 rounds on March 8, 1971. Ali’s ringside physician, Dr. Ferdie Pacheco, has called it the greatest fight Ali ever lost.

#-ad_banner-#​Well, today, more than 40 years later, there’s a highly touted new growth stock that’s sort of like that. It might be called the greatest growth stock nobody should own.

And it has been impressive, more than doubling already in the six weeks or so since its initial public offering (IPO) on August 1. The IPO raised nearly $900 million, making it the largest ever by an Israeli company.

But despite all the hype, analysts at Deutsche Bank recently showed some sense and downgraded the stock from “buy” to “hold” in the wake of its massive gains. Frankly, though, Deutsche Bank would have better served investors by recommending they sell Mobileye N.V. (NYSE: MBLY), which makes advanced driver assistance systems for the auto industry.

Now don’t get me wrong. I think Mobileye could be a great company, and Citigroup analyst Itay Michaeli may well be right to call it the auto industry’s “iPhone moment.”

After all, it’s already the number one player in one of today’s fastest-growing auto-related markets — revolutionary technologies that bring cars ever closer to being completely self-driving. In Mobileye’s case, it holds an estimated 80% share of the market for advanced driver assistance systems (ADAS) that spot potential road hazards and alert the driver in time to react.

With Mobileye, there’s a dashboard-mounted video feed that’s constantly analyzed by proprietary software. The software interprets the feed to identify objects in the car’s path that may pose a threat or simply require compliance, like other vehicles, pedestrians, stop signs and traffic lights. Mobileye claims the software can even detect lane markings and speed-limit signs.

The system emits audio and visual alerts in a couple situations, when the car veers out of its lane or exceeds the speed limit and when there’s imminent danger of collision. According to Mobileye, what sets the system apart is it operates in real time. No other camera-based ADAS can do this, the company says.

The Street expected big, big things from Mobileye. For instance, Morgan Stanley analyst Ravi Shankar sees the firm playing a key role in the eventual development of self-driving cars and enjoying very strong demand for its driver assistance technologies for years to come based on high projected adoption rates.

“We see 50% of new cars sold globally having some form of ADAS/autonomous system by 2022, rising to 70% by 2028 vs. 2% today,” Shankar recently told Barron’s. Indeed, industry safety standards may virtually mandate such systems, he said.

This year and next, he projects Mobileye will generate revenue $131 million and $211 million, respectively, and earnings per share (EPS) of $0.18 and $0.39, respectively. That’s pretty much in line with consensus estimates, which also call for the company’s EPS to climb an astounding 62.5% a year for the next five years.

This all sounds great, I know. But I still think Mobileye should be rated a “sell” right now.

For one thing, at around $52 a share, the stock is trading for nearly 290 times this year’s estimated earnings and 133 times those projected for 2015.

Incredibly, Mobileye almost makes some other excessively overpriced big-name stocks look cheap — like Facebook, Inc. (Nasdaq: FB), which trades for 48 times 2014’s projected EPS. Mobileye’s forward multiple dwarfs that of Tesla Motors, Inc. (Nasdaq: TSLA), long one of the market’s most overvalued stocks by far and currently trading for 84 times 2015’s projected EPS.

Another red flag: In all the hype surrounding Mobileye, investors may be ignoring the fact that second-quarter sales were actually down 5% from Q1 to $33.7 million.

Obviously, this isn’t nearly enough data to call the decline a trend, but it should make investors aware Mobileye can stumble. What’s more, the pace of adoption of Mobileye’s technology, clearly a long multi-year process, is likely far behind the growth of its stock price.

And along the way, the firm will have to fight off increasing competition to maintain market share, which must be protected for Mobileye to meet the lofty expectations the market has set for it. Thus, any misstep could easily crush the stock.

Risks to Consider: To many investors, Mobileye could be looking a lot like a sure thing right now, but I assure you it’s not. At some point, there’ll be problems like software bugs, malfunctions or recalls, and these sorts of things can happen at any time.

Action to Take –> After quickly reaching a high of nearly $59 following its IPO, Mobileye has begun to show weakness. The latest prices are around a 12% drop from the peak, so investors may already be coming to some of the same conclusions I’ve drawn. So if you’re the risk-taking type, I’d consider shorting Mobileye. With investors possibly beginning to have doubts about the stock, the downward momentum it’s developing could take the price a lot lower in coming weeks, perhaps even near the original IPO price of $25.

With Mobileye we presented you with a stock to short right now, but how about a stock that is expected to outperform over the long haul? My colleague Nathan Slaughter works to identify companies that are actively reducing debt, repurchasing shares and offer a solid dividend — the marks of a well-managed firm. Together those criteria are used to form a “Total Yield” score, which has led to average gains of 15% a year since 1982. For more information about the Total Yield strategy, click here.