If you want a 1,300-horspower C8 Corvette without electric assist and all-wheel drive, you now have an option. HP Tuners has finally unlocked the ECM for the 1,064-horspower Corvette ZR1. That lets you push the hyper-Vette even harder, and the company says you should be able to get up to 25% more power from your LT7 V8. The limit on that extra performance, at least according to HP Tuners, is one we haven't really seen before. Make Your ZR1 Go Zoom Or Boom Matt Sanford/Facebook Matt Sanford of HP Tuners announced the company's new ability to unlock the Z06 and ZR1 Corvettes through a very long and very detailed post to Facebook. He said the company has spent weeks testing its ZR1, and he warns that while HP Tuners can give you the capability, the DOHC, flat-plane, 5.5-liter LT7 engine isn't to be trifled with.Sanford says that if you're going to play it safe, you can unlock around 15% more power in the mid-range of the ZR1's power band, with 10% up top. With peak power of 1,064 hp, that's an extra 106 horses, not far off of the 186-hp boost the ZR1X's electric motors deliver.If you feed it with high-octane gas, what Sanford calls "a really good race fuel," then you can get around 25% more power from the engine. That's 266 extra horses, putting you somewhere around 1,330.On the company's own dyno with a play-it safe tune, the HP Tuners managed 1,180 hp and 1,094 pound-feet of torque at the wheels. We've seen stock ZR1s show wheel horsepower figures around 1,030 and torque around 840. So this is some serious extra power from a ZR1 with almost no changes and minimal spending. Warning: Danger To Manifold (And Everything Else) Matt Sanford/Facebook But Sanford wants to warn anyone hunting headline figures. He says, in all caps no less, "these cars are not the cars to take to your random local dyno shop to be tuned."The reason he gives is that "it isn't like tuning any other GM product." The dual-clutch transmission, port and direct injection systems, and complicated "airflow logic" all make it hard, but they might not be the toughest part.For the hardest limit, look to the turbochargers. Sanford says that the factory limit for turbocharger shaft speed is 137,000 rpm, and that they generally run between 130,000 and 133,000 rpm peak. He doesn't think they should be spun past 142,000 and even then, only for short bursts.Matt Sanford/Facebook He warns that tuners accustomed to more typical engines will just dial up the limiters and scale the torque model like they normally would. That "WILL make enough bottom end power to destroy the engine, clutches, etc," he says. That is his emphasis on will, not ours.The company can tweak the Z06's non-turbo LT6 as well, but he didn't provide a power figure for it. It won't be as high, but it also shouldn't have the same limitations on the transmission. And, of course, on turbo speeds.If you do want those banner numbers, he suggests swapping in port fuel injectors with more headroom to flow more gas. What we're hearing is that with some bigger turbos, the ZR1's LT7 isn't far away from being a true beast. But if you try it, you might want to start pricing out a new DCT, along with clutch upgrades. Or, you could just lay down big money for a new Corvette ZR1 that already has over 1,000 horsepower and enjoy some ridiculously excessive performance with a warranty. Nah, we wouldn't do that, either.