The Dodge Viper has always been a special car, and the argument could be made that it’s America’s first, and only, real supercar. The current iteration carries on the proud tradition of boasting a V10 engine displacing 8.4 liters and making 643 horsepower, all without the help of forced induction. Indeed, the naturally aspirated V10 is the heart and soul of the Viper, and pulling out more power without adding a turbo or supercharger can seem like a tall order.

But not for Germany’s Geiger Cars, a professional tuning shop that is always plumbing the depths of their mechanical knowledge to pull more power out of engines with minimal surgery.

Taking the already-potent V10 and adding almost 10% more power without forced induction or major modifications isn’t easy, but a specially designed cold air intake, cat-back exhaust system, and custom tuning make it possible. This takes horsepower up to an estimated 700 ponies, with torque rising from 600 lb-ft to 635, arguably the more important metric when it comes to covering supercars.

According to Geiger, these mild improvements translate to an even-faster snake, as the GTR710 (as they’re calling it) rockets from 0 to 62 MPH in just 2.9 seconds, with a top speed of 212 MPH. That’s just one-tenth of a second faster to 62 MPH but an additional 10 MPH to the top end. Add to that some subtle carbon fiber body parts and badging, and you’ve got a $24,000 performance package for your Viper that keeps its naturally aspirated integrity, while adding even more power, keeping both purists and performance enthusiasts happy.