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Big Gun Rev Box
Big Gun Rev Box

$68.39 - $179.99
10% Off - Save up to $20.00

Select your bike to see if this rev box fits
Item #GUN000N

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14 Reviews
3.9 out of 5 stars
5 Star   9 4 Star   1 3 Star   1 2 Star   0 1 Star   3
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All Reviews
Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Instant change to the power

Took less than 5 minutes to install and had immediate results.

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

hot, nasty speed!

Austintown, OH
Durability 5/5 Ease of Installation 5/5 Power 5/5 Style 5/5
Works great

I've had this for about two years now and I've had no problems with it. It does make a difference in power and top speed.

Verified Purchaser
San Diego, Ca.
Not so happy....

the big gun rev box I got and installed in my quad did not work for some reason it made my quad run like grud, so I called motosport to see what they can do for me and some guy named Isaac said "it's a electronic device so we can't take it back call the manufacture see what they say".... sweet thanks

Portland, MI
Durability 1/5 Ease of Installation 5/5 Performance 1/5 Power 1/5 Style 3/5
Waste of money

i have a 2009 TRX 450er , i plugged this box in and it literally did nothing for me. i felt absolutely no increase in power and my top speed was clocked actually a little bit slower, from 80 to 76. maybe i just got a bad box, but i am not pleased.

Boron ca
Bad product

I put this on my bike and it made it run terrible worst 200 dollars I've ever spent stock box works better

Manhattan, KS
2007 trx450r

Product works great! Big differance in the rpms. pulls hard in 4th and 5th gear can really tell the differance. Awesome!!!!

Top 500 Contributor
butler, PA
Bad luck

pulged it in & it worked great for about a month. then my fan stoped wotking & my indicator lights didnt work. i put the old one back on & everything worked again... MOTOSPORT is a great company to deal with. they got it warrantied by big gun & being the only differance was the higher rev limiter i took the credit towards some other parts.. it cant hurt to try it. mabey you will have better luck than me....

seattle washington
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Good for the price

helped wake up my 660. it should run like this from the factory

mechanicsville, va
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Best thing to get

i got a 05 400ex and when i bought this i plug it right up and like other people say the first ride you dont really feel a difference but once you ride it bout 2 or 3 times you feel the difference it did pick up on the top end but it really picked up mainly in 2nd and 3rd.... my 2nd guy wheelies i use to have to pull back some to pull it un but now it comes right up with no problem and with this box i took out to a friends far with a bunch of open land opened it up to 5th and it was still pretty easy to stand it up in 5th. great buy if u plan on racing buy it, it will help out a lot...........

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34 Questions
Answered:   33
Not Yet:   1
David 58696
Q: Will this fit my 2007 Suzuki ltz250 that has a hmf slip on ??. 
16 days ago
Top 10
16 days ago
A: Yes this would work with your atv.
Q: Will this fit my Apollo 125cc
2 months ago
Top 10
2 months ago
A: This will not fit your Apollo 125.
Q: Does it work on a 2008 Honda TRX250EX
2 months 22 days ago
Top 10
2 months 22 days ago
A: Yes, if you profile your machine accordingly, this will provide you the part needed for your 2008 TRX250EX.
Q: How is this compared to the bbr cdi box in terms of power?
4 months 19 days ago
Top 10
4 months 19 days ago
A: They are extremely similar and very very close in rpm and overall power gains.
Q: Will it fit my 2007 Honda 250ex
4 months 22 days ago
Top 25
4 months 22 days ago
A: Yes it will just make sure you profile you make model and year before adding to the cart
Q: Will it work my 100r Honda 1999
4 months 28 days ago
Top 10
4 months 28 days ago
A: These are made for universal fitment, for your bike however, you will need to find a reliable power source, and may need to see if there is a regulator rectifier available for your bike to be able to use this.
Q: Will it work fir 2017 Honda trx250x
Over 8 months ago
Top 10 Contributor
Over 8 months ago
A: Yes it will work for 2009-2018 trx 250x
Q: I need a CDI UNIT for a 2003 250sx two stroke
Over 9 months ago
Top 10 Contributor
Over 9 months ago
A: KTM has discontinued the CDI for you bike.
Q: 400ex powercore 4
Over 9 months ago
Will this work on my 2004 400ex with a power core 4 slip on or does it only work with the big gun exhaust ?
Top 10 Contributor
Over 9 months ago
A: Yes it will work.
Q: Will this fit a honda xr100r 2003
1 year 8 months ago
Expert MotoSport Staff
1 year 8 months ago
A: YES! Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct box for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
1 - 10 of 34
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Big Gun Rev Box N/A
Big Gun Rev Box 40-R10A
Big Gun Rev Box 40-R10C
Big Gun Rev Box 40-R19A
Big Gun Rev Box 40-R19
Big Gun Rev Box 40-R21
Big Gun Rev Box 40-R05C
Big Gun Rev Box 40-R32
Big Gun Rev Box 40-R10B
Big Gun Rev Box 40-R09A
Big Gun Rev Box 40-R11
Big Gun Rev Box 40-R28
Big Gun Rev Box 40-R20
Big Gun Rev Box 40-R22
Big Gun Rev Box 40-R01
Big Gun Rev Box 40-R24
Big Gun Rev Box 40-R16
Big Gun Rev Box 40-R03
Big Gun Rev Box 40-R06
Big Gun Rev Box 40-R04
Big Gun Rev Box 40-R09
Big Gun Rev Box 40-R02B
Big Gun Rev Box 40-R02
Big Gun Rev Box 40-R02A
Big Gun Rev Box 40-R30A
Big Gun Rev Box 40-R10
Big Gun Rev Box 40-R10G
Big Gun Rev Box 40-R25
Big Gun Rev Box 40-R31