ATC70 / TRX70 Stainless Steel Up QX Pro Exhaust

Take your ATC70 or TRX70 build to the next level with the Quadryx High Flow Stainless Full Exhaust System. Built for riders looking for improved exhaust flow, stronger throttle response, and an aggressive performance tone, this complete system combines premium stainless steel construction with a clean, race-inspired design.

Designed to support everything from stock 72cc engines to high-performance 212cc 4-valve builds, the free-flowing header and large-core muffler allow the engine to breathe efficiently throughout the RPM range. Whether you're restoring a classic Honda 70 or building a high-horsepower custom machine, this exhaust delivers the performance, durability, and appearance to match.

Constructed from corrosion-resistant stainless steel, the system features smooth-flowing bends, precision welds, and a lightweight design without sacrificing strength. The fiberglass-packed muffler produces a deep, crisp exhaust note, while the removable baffle allows you to adjust the sound level to suit your riding preference.

A clean, compact muffler profile and integrated heat shield complete the system, giving your ATC70 or TRX70 a premium finish without the oversized appearance of traditional aftermarket exhausts.

Features

• Complete stainless steel full exhaust system
• High-flow header and large-core muffler design
• Engineered for stock 72cc through 212cc 4-valve builds
• Smooth-flowing bends for efficient exhaust velocity
• Precision-welded stainless steel construction
• Lightweight yet durable performance design
• Fiberglass-packed muffler for a deep, aggressive tone
• Removable baffle for adjustable exhaust sound
• Heat shield included for added protection
• Compact, race-inspired muffler styling
• Corrosion-resistant stainless steel construction
• Designed for performance and custom Honda 70 builds

Fitment

• Honda ATC70 (1978–1985)
• Honda TRX70 (1986–1987)

Includes

• Stainless Steel Exhaust Header
• High Flow Muffler with Removable Baffle
• Exhaust Header Gasket
• Muffler Retention Spring
• Heat Shield
• Heat-Resistant Adhesive for Plastics
• Installation Hardware

Installation Notes

Drum Brake Clearance: This exhaust features a close-fitting header that runs near the factory drum brake cover. Clearance is tight, so minor positioning adjustments may be necessary during installation to ensure proper spacing.

YX140 Engine Fitment: When installing with a YX140 engine, the header may require slight repositioning to maintain access to the engine oil fill plug. This is a straightforward adjustment and does not require major modifications.

Installation Tip: We recommend leaving all exhaust mounting points slightly loose during initial installation. Position the header and muffler to achieve proper clearance around the drum brake cover and oil fill plug before fully tightening the hardware. Taking a moment to adjust the system before tightening everything down will help ensure a clean, proper fit.

Built for riders who demand more than a basic replacement exhaust, the Quadryx High Flow Stainless Full Exhaust System delivers an excellent combination of performance, sound, and premium construction for your Honda 70 build.