Big Gun Exhaust Rev Box 9000-9750 - 40-R20

Big Gun

  • $133.76
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If you are looking to swap out your stock CDI box, the Big Gun Rev Box is an affordable alternative to highly-priced OEM replacement boxes. It increases the overall RPM limit over the stock box and advances the timing curve. The Big Gun Rev Box is offered for various offroad MX and ATV models.


  • Increases overall RPM limit
  • Advanced timing curve
  • Easy direct plug in replacement to stock CDI box
  • 6 month Limited Warranty


  • 2001-2011 Honda TRX250EX SporTrax
  • 1997-2012 Honda TRX250 FourTrax Recon
  • 2001-2011 Honda TRX250X SporTrax
  • 1997-2012 Honda TRX250TE FourTrax Recon ES
  • 1997-2012 Honda TRX250TM FourTrax Recon

Brand: Big Gun Exhaust
Part Number: 40-R20

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