Thunder Products TPI Valve
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Thunder Products TPI Valve

Part# 1027260001

Our price: $21.99

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  • TPI valve works with your air box lid to add air when you need it, and keep the intake stock when you don't.
  • 2 5/8" square TPI valve filters air and vent size is adjustable.
  • Comes with a black medium filter, mounting hardware and instructions.
  • One TPI valve is adequate for most machines but for machines with engines 500cc and over, or with highly modified engines two valves work best.

Thunder Products TPI Valve Reviews

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0 of 0 people found this review helpful.

Not just a gadget......it really works.

Comments On Jul 20, 2013:I was kind of disappointed in the size of the vent when it arrived because the description said it was supposed to be 2 5/8". Well, the whole unit is that size but the vent window itself is only slightly bigger than an inch. However, that proved to big enough to make my Kawasaki 700 run great up to 9000 feet elevation. For going above that, two of these units will be needed with that engine size. But this valve worked great and when closed, it lets in absolutely no dust or water. Wide open, the pre-filter worked good enough but you probably won't want to follow anyone too close on a really dusty road.

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as expected

Comments On May 07, 2013:as expected

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0 of 0 people found this review helpful.

Worked great!

Comments On Oct 16, 2009:I was taking a trip to UT..I live in OH. Some forums recommended installing these to deal with the elevation difference. Worked great, didn't need to rejet. I'd recommend this product.

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TPI valve

Comments On Oct 18, 2009:Good product, better than drilling holes in your airbox, safer than removing your airbox lid.

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1 of 1 people found this review helpful.

works great! gets brittle easy though!

Comments On Oct 02, 2009:put 2 in my warrior 350 air cover and noticed better throttle response! but went to close one of them after about a month and the plastic broke.... wont buy again cuz the price is way to steep! now i just drill holes where i need them and that seems to work even better!

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0 of 0 people found this review helpful.

TPI valve

Comments On Jan 30, 2008:works great

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1 of 1 people found this review helpful.

Small

Comments On Dec 24, 2007:I thought it would be a lot bigger and allow more air. Well it's like a 1.5inch square opening. Not very cool.

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Works as claimed

Comments On Dec 16, 2007:I have two installed in air box cover of my 05 KFX400. I open or close the shutters based on temperature (summer vs winter). Easier than rejetting the carb every season.

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