AT YOUR SERVICE
Quality Parts. Quality Repairs.
Custom Performance & Classic Car Services in Boonton, NJ
Modern performance builds and classic vehicle restorations require far more than basic mechanical skill. High-quality automotive customization combines engineering expertise, meticulous workmanship, and a profound understanding of how performance, comfort, and reliability interrelate. From driveline changes to comfort enhancements, professional automotive services help vehicle owners unlock the full potential of their cars while preserving long-term value.
​
Whether you're upgrading a weekend performance vehicle or refining a classic car for daily driving, specialized services guarantee the proper matching, installation, and tuning of components. The right modifications improve drivability, braking control, cooling efficiency, and overall responsiveness while reducing wear on surrounding systems. With the correct planning and execution, customized automotive work transforms how a vehicle feels, performs, and lasts on the road.
Comprehensive Performance & Custom Automotive Solutions
Performance-focused automotive work covers a wide range of services, from manual and automatic transmission swaps that change driving dynamics to brake conversions that enhance stopping power for modern road demands. Suspension geometry and drivetrain strength also play a major role in vehicle stability, making custom suspension upgrades & installation and rear-end upgrades essential for improved traction and handling.
​
Comfort enhancements matter just as much as performance, especially in classic vehicles. Vintage air conditioning systems and vintage air system upgrades allow older cars to maintain period-correct aesthetics while delivering modern cooling reliability. When additional power is the goal, performance upgrades paired with proper performance tuning services help ensure modifications work together efficiently rather than stressing the engine.
​
Routine maintenance and a precise tune-up are critical foundations for any modified vehicle. Without proper baseline care, even the most advanced upgrades cannot perform reliably. Specialized drivetrain projects such as classic custom car engine swaps and stick shift conversion work require expert planning to integrate modern powertrains while maintaining safety and balance.
ENGINE SWAPS
6 Cylinder to V8, small blocks, big blocks
Swap out your stock tired engine for something with a lot more horsepower. 6 cylinder to V8, built crate engines, or even just stock replacements.
TRANSMISSION SWAPS
Manual or Automatic
Whether you're looking for a 5 or 6 speed Tremec manual transmission, upgraded automatic, or even a simple  4 speed swap we are capable of getting the job done right.
BRAKE CONVERSIONS
Power brakes, front/rear disc brake conversions
Going fast is one thing, but being able to stop property is just as important. It's time for you to toss out your dated drum brake system and upgrade to a better disc brake system.
UMI Performance upgrade on a 2002 Camaro z28
SUSPENSION AND REAR END UPGRADES
Make your classic handle better than new with a few upgrades or just a simple refresh
Front end rebuilds, coil overs, tubular control arms, lowering kits, traction bars, sub-frame connectors, slapper bars, upgraded axles, rear end swaps, rear gear ratio changes, and much more.
VINTAGE AIR CONDITIONING
Retro kits, installations, servicing
From simple service to full installations. R-12 to R-134 conversions, vintage air installs, diagnosis, recover, evacuate, and charge system.
PERFORMANCE UPGRADES AND MODIFICATIONS
Power adders and aesthetic upgrades
Aluminum heads, valve covers, camshafts, rocker arms, intake manifolds, MSD systems, EFI, carburetors, serpentine belt systems, shifter kits, clutch/converter upgrades, aluminum radiators, gauges, and much more.
MAINTENANCE, TUNE-UP, AND REPAIRS
Maintain and repair all your vehicles needs
Fluid changes, component inspections, diagnosis, ignition tune up, carburetor adjustments, PCV service, chassis greasing, filter replacements, brake services, gasket replacements and much more.
EXHAUST SYSTEMS
Repair and installs
Headers, complete stainless steel systems, mufflers, muffler deletes, cut-outs, gasket replacement, system repair
Expert Automotive Customization at Day Two Automotive LLC
At Day Two Automotive LLC, every project is approached with a performance-first mindset and meticulous attention to detail. The shop specializes in advanced custom car modifications that blend craftsmanship with technical accuracy, ensuring upgrades enhance both form and function. Whether improving braking confidence through performance brake upgrades or strengthening driveline durability with a precise rear-end modification, all work is tailored to the vehicle’s intended use.
​
Clients rely on the team for dependable performance car repairs that address issues caused by wear, age, or previous improper installations. Exhaust flow and sound quality are also carefully handled through professional exhaust system repair, ensuring optimal performance without sacrificing drivability. Each service is performed with quality components, clear communication, and a commitment to long-term reliability.
​
Serving Boonton and surrounding areas, Day Two Automotive LLC is trusted by enthusiasts who value precision, honest recommendations, and results that perform as intended both on the street and at the track.