ATC70 / TRX70 Stainless Steel Up QX Pro Titanium Exhaust

Take your ATC70 or TRX70 build to the next level with the Quadryx High Flow Titanium Full Exhaust System. Built for riders looking for improved exhaust flow, stronger throttle response, and an aggressive performance tone, this complete system combines premium titanium construction with a distinctive, 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 lightweight, corrosion-resistant titanium, the system offers exceptional strength while reducing weight compared to traditional stainless steel exhausts. Smooth-flowing bends and precision welds provide a premium finish, while the fiberglass-packed muffler produces a deep, crisp exhaust note. The removable baffle allows you to adjust the sound level to suit your riding preference.

What sets this system apart is its heat-treated blue titanium heat shield and carbon fiber muffler tip. The vibrant blue finish adds a distinctive custom appearance, while the carbon fiber outlet gives the compact muffler a refined, high-performance look. Together, these details create a premium exhaust system that stands out without the oversized appearance of traditional aftermarket designs.

Features

• Complete lightweight titanium full exhaust system
• High-flow header and large-core muffler design
• Engineered for stock 72cc through 212cc 4-valve builds
• Premium titanium construction for excellent strength-to-weight performance
• Significant weight savings compared to traditional stainless steel exhausts
• Smooth-flowing bends for efficient exhaust velocity
• Precision-welded construction
• Fiberglass-packed muffler for a deep, aggressive tone
• Removable baffle for adjustable exhaust sound
• Heat-treated blue titanium heat shield for a distinctive custom finish
• Carbon fiber muffler tip for premium race-inspired styling
• Compact, high-performance muffler profile
• Excellent corrosion resistance and durability
• Designed for performance and custom Honda 70 builds

Fitment

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

Includes

• Titanium Exhaust Header
• High Flow Titanium Muffler with Carbon Fiber Tip and Removable Baffle
• Exhaust Header Gasket
• Muffler Retention Spring
• Heat-Treated Blue Titanium 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.