Lots of choices in off-road parts. Exhaust systems should be at the top of your list. A 400EX exhaust will give your quad smoother and more consistent power delivery.
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 2004 TRX 400ex STOCK HEADPIPE HEAD PIPE EXHAUST 400 EX  US $42.99
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 HONDA TRX400EX KIBBLEWHITE EXHAUST VALVE TRX 400EX 99 US $29.99
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 2005 TRX 400ex STOCK MUFFLER EXHAUST 400 EX no insert US $68.99
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 HONDA TRX400EX 99 08 WISECO EXHAUST VALVE US $35.85
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 3D POWER TIP EXHAUST TIP HONDA TRX 400EX 400 EX 400X US $57.95
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 Honda TRX400 400EX 400 Stock Exhaust Muffler US $24.99
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 EXHAUST FLANGE 86 89 honda 250r trx250r atc trx 99 04 400ex pipe fitting mount US $9.50
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 HONDA 400EX PAIR OF EXHAUST MOUNT BRACKETS SPORTRAX US $6.95
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 HONDA TRX400EX TRX 400EX WISECO EXHAUST VALVE 1999 2008 US $35.95
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 TRX400EX TRX 400EX 400 Header Head pipe Exhaust US $59.99
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