Pro Circuit T-4 Exhaust System 4QH90090 - Honda TRX90 / TRX90EX / TRX90X 1993-2009

Product Description

The Pro Circuit 4QH90090 T-4 Exhaust System is engineered to unlock maximum engine output and enhance overall performance for your Honda TRX90 youth quad. Designed as a complete replacement for the restrictive stock pipe, this full exhaust system delivers improved power delivery throughout the rev range alongside a deep, crisp exhaust note that brings your machine to life.

Built for durability and lightweight performance, the T-4 system features a brushed 6061-T6 aluminum canister paired with a stainless steel header pipe and conical end cap. The design includes tunable end caps to help fine-tune power delivery for various terrain and riding conditions, while steel allen-head screws allow for easy repacking using the included extra E-glass pillow packing.

Top Features: Pro Circuit T-4 Exhaust System

• Full exhaust system designed to increase power delivery and produce an improved exhaust note.
• Lightweight 6061-T6 brushed aluminum muffler body with stainless steel intake tube and end cap.
• Tunable end-cap design allowing customization of power delivery for specific riding conditions and terrain.
• Steel allen-head fastener assembly engineered to make routine muffler repacking quick and simple.
• Includes exclusive high-density E-glass pillow packing plus extra packing material in the box.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Does this Pro Circuit T-4 exhaust come with muffler packing included?
A: Yes, the exhaust system comes pre-packed with exclusive E-glass pillow packing and includes extra packing in the box for future maintenance.

Q: What materials are used in the construction of the T-4 system?
A: The canister is constructed from brushed 6061-T6 aluminum, while the head pipe, intake tube, and conical end cap are built from stainless steel.

Expert Pro-Tip:

Expert Pro-Tip: Whenever installing a full exhaust system on a carbureted quad like the TRX90, always check your air-fuel mixture and carb jetting. Increasing exhaust flow reduces backpressure, so stepping up the main jet size slightly will ensure optimal throttle response, prevent lean running conditions, and protect engine valves from excess heat.

Recommended Pairings:

• All Quads & ATV Performance Parts
• Honda Performance Parts
• Off-Road Maintenance Tools

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