With gas prices falling, it shouldn’t come as a surprise that Dodge has built more than 4,000 of its 6.2 liter HEMI Hellcat V8 engines in 2015, and still has a backlog of orders to work through. The assembly line in Saltillo, Mexico, has been working full-tilt to keep up with demand for the 707 horsepower motor, but it hasn’t been enough.

In an interview with Automotive News, head of the Dodge and SRT brands Tim Kuniskis said that there’s been a “huge flood” of orders for Hellcat-equipped Dodge Chargers and Challengers, with sales twice exceeding internal expectations. Dodge stopped taking orders for Hellcats months ago, and the company is working through a backlog of Challenger Hellcats before it even begins building the four-door Charger versions. Kuniskis declined to say how many Hellcat engines FCA intended to build, but we don’t see any reason to cap production on a car in such high demand.

The Hellcat is having a positive influence of sales on the rest of the Dodge muscle car lineup as well. Combined sales of the Charger and Challenger have risen to 88,000 vehicles so far in 2015, and through the first quarter of the year Challenger sales were up 41%, even though the 2016 model hasn’t hit showrooms yet. Low gas prices and a mild refresh have certainly helped, but the “Hellcat effect” as we’re calling has made it so there’s a zero-day supply of the Scat Pack Challenger, which is a step below the supercharged model.

From the sounds of it, Dodge will start taking orders for the Hellcat once the 2016 model debuts, and from the sound of it, there’s plenty of people waiting to plunk down sixty-grand for a place in line. It is, after all, the highest-horsepower production muscle car you can buy today, and it easily ranks among the top 1% most powerful vehicles on the planet. As fast as it is though, it sounds like it is taking awhile to get to the garages of eager owners.