Custom Auto Modifications in St. Charles, IL – Performance & Style Upgrades

We specialize in bringing classic cars back to life with classic car repair and custom modifications. With over 30 years of experience, we guarantee top-tier craftsmanship and meticulous attention to detail. Let us transform your vintage vehicle into a masterpiece.

Maximize your car’s performance with expert engine modifications and tuning at Old Skool Garage. Whether you need custom tuning, performance upgrades, or complete engine modifications, our 30+ years of experience ensure precision and power. From carburetor tuning and fuel injection upgrades to camshaft swaps and dyno tuning, we fine-tune every detail for optimal horsepower, torque, and drivability.

Unlock more power and reliability with a custom engine rebuild or swap at Old Skool Garage. Whether you’re rebuilding a classic, upgrading your hot rod, or boosting performance with a modern engine swap, our certified technicians bring 30+ years of expertise to every build. From high-performance tuning to full rebuild services, we deliver precision craftsmanship and top-tier results.

Enhance your muscle car’s power, sound, and performance with a custom exhaust system upgrade at Old Skool Garage. From headers and high-flow catalytic converters to full custom exhaust fabrication, we ensure a perfect fit and optimal performance. With 30+ years of experience, our expert team delivers precision installation for classic cars, hot rods, and modern muscle machines.

Our suspension upgrades improve your vehicle’s ride quality, handling, and stance. Whether you need a lowered performance setup, air suspension for adjustable ride height, or a fully custom suspension system, we create solutions tailored to your driving preferences.

Transform the look of your vehicle with our custom body kits. Designed for both aesthetics and aerodynamics, our body modifications range from subtle enhancements to bold, one-of-a-kind designs that make a statement on the road.

We tailor the interior of your car to reflect your personality and comfort preferences. From custom upholstery and high-end materials to modern infotainment systems and ergonomic enhancements, we create an interior that’s as enjoyable as it is stylish.

A brake system upgrade involves replacing or enhancing the stock braking components to improve stopping power, responsiveness, and safety. Upgrades may include larger brake rotors, high-performance calipers, stainless steel brake lines, and advanced brake pads for better heat dissipation and reduced brake fade, especially under high-speed or heavy-load conditions.

A crate engine install refers to replacing an existing engine with a brand-new, pre-assembled engine (also known as a crate engine) sourced from a manufacturer. These engines come ready for installation, offering increased performance, reliability, and efficiency. Crate engines are available in various configurations, from stock replacements to high-performance options designed for racing, off-roading, or custom builds.

The fuel system is responsible for delivering the right amount of fuel to the engine for optimal combustion. Upgrading a fuel system may involve installing high-flow fuel injectors, performance fuel pumps, larger fuel lines, and upgraded fuel pressure regulators. These modifications improve fuel delivery efficiency, enhance engine performance, and support higher horsepower applications.

A/C system integration involves installing or upgrading an air conditioning system in a vehicle that may not have originally come with one or improving an existing system. This process includes fitting modern compressors, condensers, evaporators, and electronic controls to ensure efficient climate control and comfort. Custom A/C integration is especially common in classic car rebuilds, where factory air conditioning was not originally available.