Plug-and-play automatic reverse lights and a beeper for your ATV or UTV. No cutting. No splicing required.

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Polaris Boost 850 Turbo ECU Tune – Stage 1 Up to 40+ HP (143-109)
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Polaris Boost 850 Turbo ECU Tune – Stage 1 Up to 40+ HP (143-109)

$899.95
  • CAD: CA$1,227.86
  • EUR: €828.49
  • SEK: 9,510.34 Skr
  • NOK: Nkr9,451.18
  • GBP: £705.09
In Stock
SKU:143-109
Unlock up to +40 horsepower from your Polaris Boost with Straightline’s Stage 1 ECU Flash Tool. Three selectable tunes in one flash, pump-gas ready, and packed with advanced diagnostics, data logging, and plug-and-play ease — no laptop required.
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(8 Reviews)
Polaris Boost 850 Turbo ECU Tune – Stage 2 Up to 40+ HP Includes Clutching & Silicone Tube Kit (143-110)
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Polaris Boost 850 Turbo ECU Tune – Stage 2 Up to 40+ HP Includes Clutching & Silicone Tube Kit (143-110)

$1,499.95
  • CAD: CA$2,046.47
  • EUR: €1,380.85
  • SEK: 15,850.92 Skr
  • NOK: Nkr15,752.32
  • GBP: £1,175.18
In Stock
SKU:143-110
Unlock up to +40 horsepower from your Polaris Boost with Straightline’s Stage 1 ECU Flash Tool. Three selectable tunes in one flash, pump-gas ready, and packed with advanced diagnostics, data logging, and plug-and-play ease — no laptop required.  Included Clutch kit to match and the Silicon intake tube kit.
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(5 Reviews)
Polaris Boost 850 Turbo ECU Tune – Stage 3 Up to 40+ HP Includes Clutching & Silicone Tube Kit (143-111)
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Polaris Boost 850 Turbo ECU Tune – Stage 3 Up to 40+ HP Includes Clutching & Silicone Tube Kit (143-111)

$1,999.95
  • CAD: CA$2,728.65
  • EUR: €1,841.15
  • SEK: 21,134.73 Skr
  • NOK: Nkr21,003.27
  • GBP: £1,566.92
In Stock
SKU:143-111
Unlock up to +40 horsepower from your Polaris Boost with Straightline’s Stage 1 ECU Flash Tool. Three selectable tunes in one flash, pump-gas ready, and packed with advanced diagnostics, data logging, and plug-and-play ease — no laptop required.  Included Clutch kit to match and the Silicon intake tube kit.
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(1 Review)
Straightline Performance Arctic Cat 858 Complete Nitrous Kit
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Straightline Performance Arctic Cat 858 Complete Nitrous Kit

$674.95
  • CAD: CA$920.87
  • EUR: €621.36
  • SEK: 7,132.62 Skr
  • NOK: Nkr7,088.26
  • GBP: £528.81
In Stock
SKU:161-110
Transform your Arctic Cat 858 into a 200+ horsepower machine with the Straightline Performance Complete Nitrous Kit. Designed exclusively for the 858 platform, this complete bolt-on system delivers an instant 35 horsepower increase while operating on 91-octane pump gas. Engineered for maximum reliability and easy installation, the kit includes everything needed for installation and pairs perfectly with the Straightline Performance Quiet Lightweight Muffler, which is required for proper exhaust flow and peak performance. If you're looking for the biggest horsepower-per-dollar upgrade available for your Arctic Cat 858, this is it.
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(1 Review)

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Straightline Performance Inc.

10317 Liberty LN
Chisago, MN 55013

Hours
Monday-Friday - 9am-5pm CST