HKS LES-H05 Legal Sport Exhaust for 1988-1991 Honda Civic Si EF

Vehicle Fitment

• 1988-1991 Honda Civic Si (EF, FWD, D16A7)

Features

• HKS LEGAL Sport exhaust system (LES-H05)
• Designed to reduce backpressure and improve exhaust flow compared to stock
• Sport-oriented R-2 tip styling for a clean performance look
• 50 mm main piping diameter optimized for small-displacement engines
• 60 mm polished tip for enhanced rear aesthetics
• High-quality stainless steel construction for corrosion resistance
• Engineered to broaden torque band and increase peak power
• Direct bolt-on installation using factory hanger points

Specifications

• Part Number: HKS LES-H05
• Exhaust Type: Legal Sport exhaust system
• Main Pipe Diameter: 50 mm (approx. 2")
• Tip Diameter: 60 mm (approx. 2.36")
• Tip Style: R-2
• Material: SUS304 stainless steel piping with SUS409 coated sections
• Exit Configuration: Single rear exit
• Fitment: 1988-1991 Honda Civic Si (EF chassis, FWD)
• Engine Compatibility: D16A7 SOHC

Included Components

• 1x HKS LES-H05 sport exhaust assembly
• 1x Exhaust tip
• Installation hardware (bolts, nuts, gaskets)
• Installation instructions

Product Description

The HKS LES-H05 Legal Sport Exhaust is a performance-oriented exhaust upgrade engineered for the 1988-1991 Honda Civic Si (EF chassis) equipped with the D16A7 engine, designed to enhance both sound and performance over the factory exhaust. Utilizing a 50 mm main pipe and signature R-2 styled 60 mm tip, this HKS system improves exhaust flow for broader torque and increased peak power while maintaining a legal-friendly sound profile.

Constructed from high-quality stainless steel materials and designed for a direct bolt-on installation using OEM hangers, the LES-H05 tailors the exhaust note for a sportier driving experience without excessive drone. The R-2 tip adds a performance aesthetic to the rear of the car, making it a popular upgrade for Civic Si owners seeking a balanced combination of style, sound, and improved performance.