ATC70 / TRX70 Stainless Steel Up High Flow HD Exhaust

Take your ATC70 or TRX70 build to the next level with a true performance-focused exhaust. The High Flow HD system is engineered for riders who want real gains, superior tone, and tank-like durability. Built around a 31 mm heavy-wall stainless header, this exhaust is designed to move air efficiently—feeding everything from stock motors to full 212 cc 4-valve big-bore monsters.

A fiberglass-packed, high-flow muffler delivers a deep, authoritative exhaust note without sounding harsh or tinny. Every bend, cut, and weld is done with precision: mandrel-bent tubing, CNC-cut components, and clean TIG welds throughout. It's a premium system that looks just as serious as it performs.

Features

• Designed for engines ranging from stock 72 cc to 212 cc 4-valve builds
• Heavy-wall stainless-steel construction for maximum durability
• Deep, aggressive performance tone
• Flow-optimized header for big-bore power
• Zero rust, zero flaking — true stainless throughout
• Fits ATC70 (’78–’85) and TRX70 (’86–’87)

Engineered for builders who want the strongest, cleanest, highest-quality system available, the High Flow HD is the top-tier exhaust upgrade for Honda 70-class trikes and quads.