ATC70 / TRX70 Classic Big Bore Low Mount Exhaust

Keep the classic low-pipe look while getting the most out of your stock or big bore setup. The Classic Big Bore exhaust is designed to deliver proper flow across a wide range of engines — from stock 70cc motors up through 140cc builds — without sacrificing performance where it matters.

This system uses a straight-through perforated core with a fiberglass-packed muffler, giving it the airflow needed to support 88cc and 108cc big bore kits while still performing properly on smaller engines. Even on 140cc setups, it maintains strong, usable flow without choking the motor or over-exhausting it.

Finished in a flat black high-temp coating, it keeps a clean, factory-inspired look that works perfectly on restoration-style builds or mild performance setups.

Designed for proper fitment with stock or up-swept peg setups like our Solid Steel Classic Plus Pegs. Not intended for low flat-mount peg configurations.

Features

• Stock-style low mount exhaust routing
• Optimized flow for stock through 140cc engines
• Ideal for 88cc and 108cc big bore setups
• Clears bottom mount electric start motors
• Straight-through perforated core design
• Fiberglass-packed muffler
• Steel construction with flat black high-temp finish
• Clean, classic factory-style appearance
• Fits ATC70 (’78–’85) and TRX70 (’86–’87)

Important Notes

• Requires stock pegs or up-swept peg setups
• Not compatible with low or wide peg configurations
• Best suited for stock to mid-level performance builds (70cc–140cc)