Audi

S4 B5

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aesthetics
brakes
engine
exhaust
interior
reliability
suspension
Stage 1 ECU Tune
Software tune providing 65HP/87TQ gains for under $500, can be performed in minutes through OBD2 port
engine
K04 Turbo Upgrade
Popular turbo upgrade using Borg Warner K04-025/026 turbos, capable of 450hp with supporting modifications
engine
034 Motorsport Density Line Motor Mounts
Street and track density options eliminate drivetrain slop, 25% reduction in movement with lifetime warranty
engine reliability
Bilstein PSS9 Coilovers
Adjustable dampening coilovers with 60,000+ mile durability, preferred by AWE Tuning specialists
suspension
H&R Coilovers
Matched spring/damper combination offering height adjustment with 'always solid' build quality
suspension
StopTech 332 Big Brake Kit
332mm front brake upgrade for track preparation, widely used with reasonable pricing and proven reliability
brakes
AWE Tuning Intercooler Upgrade
Front-mount intercooler upgrade supporting up to 400bhp safely with improved cooling efficiency
engine
Milltek Exhaust System
Resonated or non-resonated cat-back systems with excellent build quality and minimal drone characteristics
exhaust
RS4 Replica Wheels (18x8.5 ET35)
Popular aesthetic upgrade mimicking B5 RS4 style, requires proper ET35 offset for optimal fitment
aesthetics
034 Motorsport X34 Carbon Fiber Cold Air Intake
Carbon fiber CAI supporting up to 800hp with improved airflow and enhanced intake sound
engine
Clutch Upgrade (Stage 2/3)
Essential upgrade for K04 turbo conversions, stock clutch cannot handle increased power levels
engine reliability
RS4 Fuel Injectors and MAF Housing
Essential fueling upgrades for K04 conversions, prevents lean conditions and supports 450+ horsepower
engine reliability
BBS LM Wheels
Lightweight forged wheels at 9.79kg for 18x8, excellent weight reduction and classic motorsport aesthetic
aesthetics
Downpipes (High-Flow or Catless)
Critical exhaust upgrade providing significant sound improvement and modest power gains, essential for full exhaust potential
exhaust
Short Shift Kit
Reduces throw distance by 25-40% with improved shift precision, popular modification for manual transmission cars
interior
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