When it comes to hot Mopars, SRT models are among the most ferocious, but among them are even more hardcore models with the ACR name. ACR stands for American Club Racer, and only a few Dodge models have ever had ACR packages. The Dodge Viper is probably the best-known, but Dodge's humble Neon also had ACR versions, even with the first-generation.But ACR also came to the later SRT-4 cars, the ones that already had an aggressive turbocharged four-cylinder under the hood. One of them is now for sale on Bring A Trailer, and it's looking like it'll go for some pretty big money thanks to a combination of rarity, power, and ultra-low miles.Bring A Trailer This ACR Has All The Mopar Goodies The standard Neon SRT-4 was a feisty little sedan when it launched. It made 215 horsepower (230 after 2004) and 250 pound-feet of torque at a time when most of its direct rivals hadn't even touched 200 ponies. It also got upgraded suspension and brakes, and a body kit that made it clear that the SRT-4 dreamed of being a Viper. A Torsen limited-slip differential also became standard from 2004 onward.When the ACR package became available, it brought a few more goodies. That includes wider 225-mm tires on lighter 16-inch BBS wheels (rather than the standard 17-inch ones), adjustable shocks, a stiffer front anti-roll bar, and seats that accommodate racing harnesses. From the photos and the description of this example, it still has those parts, except for the wheels, which have been replaced with Enkei RPF-1s. The car also shows that the ACR got subtle, but racy, decals proclaiming its seriousness, and the sports seats also got the logo on the seat backs.Bring A Trailer This SRT-4 doesn't just have the ACR package, though. It also has the Stage 3R turbo upgrade kit from Mopar. Back in the day, Mopar had a couple of stage upgrades for the SRT-4 that boosted power, and the Stage 3R was near the top of the range. It was a comprehensive kit that replaced the turbocharger, exhaust manifold, fuel pump, fuel rail, fuel injectors, sensors, and added a new engine computer tune. That tune also enabled more aggressive boost delivery in first gear, flat-foot shifting to keep boost up between gears, and a redline increase from 6,240 rpm to 6,500.Bring A Trailer All those changes led to a massive increase in power. According to a product document included with the car, output on pump gas went to 310 hp and 325 lb-ft of torque. That was more power than contemporary Nissan 350Zs or Ford Mustang GTs. If equipped with the Turbo Toys option, which added an intercooler sprayer, boost control dial, and a switch to run on fuel with 100 octane or higher, it could make a shocking 355 hp and 365 lb-ft. This example seems to have those parts.Bring A Trailer The owner has also made a few other upgrades. It has an even bigger intercooler than the stock one, plus an aftermarket cat-back exhaust and blow-off valve. The front brakes come from the Viper, and it has strut tower braces, all of which will be welcome for keeping that power in check. 4,500 Miles, Clean, And Probably Expensive Besides being a tiny monster, this SRT-4 also looks immaculate. The interior looks perfect, and any changes the owner has made has been very subtle and easily reversible. It has only been in one family, and it has just 4,500 miles, which is slightly sad considering this must be such a hoot to drive. As a result, the bid, at the time of writing, now sits at $30,000, potentially making it the most expensive Neon to cross the Bring A Trailer block. Or dare we say, any auction block?Bring A Trailer Whatever the price ends up at, the car will sell, since it's a no reserve listing. Also, while $30,000 seems like a lot for a two-decade-old Neon, keep in mind that this is still much less money for even more power than a new Civic Type R. So maybe it's actually a deal.