Rumors about a new Corvette ZR1 have gone on far too long, and it looks like they're not going to end today. Our spy photographers caught two separate prototypes that likely preview the next Chevrolet Corvette ZR1.

If you think the Corvette Z06 doesn't push the limits far enough, perhaps this hotted-up model will do the trick. One of the mules features a very tall pedestal for mounting a rear spoiler, and our spy photographers said it appeared to match the height of a GT3 race car. Upon closer inspection, you'll notice this same prototype is carrying a tall, bubble-wrapped object inside the cabin. That could very well be the car's spoiler, or more aggressive rocker panels. This model also features red brake calipers. In photos of the other prototype, however, you'll notice it dons blue brake calipers, yet another sign that points to the ZR1.

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Up front, the Corvette receives new air vents on either side of the front fascia. Although it's too soon to know about the engine, this finding feeds rumors that the new 'Vette will feature an "LT5" twin-turbo V-8 setup that would likely involve intercoolers positioned up front. The power bulge hood also looks like it could be larger to improve airflow, although it's hard to tell through the massive amount of camo.

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The side of the vehicle doesn't appear camouflaged, but Chevy could still have a trick up its sleeve. The unfinished doors could point to a new carbon fiber design, which would help the car save precious weight.

Naturally, the next big rumor we have to address is the mid-engine Corvette. We recently spied a prototype that could preview such a model, and it looked a bit different. Over its rear hatch, it was missing a glass cover that would otherwise hinder cool air from getting to the engine behind the seats. Our spy photographers said that on these new prototypes, which we think hint at the ZR1, they only spotted a car cover sitting back there.

We hear a mid-engine Corvette could arrive in 2019. The ZR1 could be a send-off for the front-engine C7 Corvette, but we think the model will coexist with the mid-engine Corvette. Check out the full gallery below for a closer look at these prototypes.

Photo source: Chris Doane Automotive