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The GYTR Air Flow Kit is designed to increase air box volume and air flow resulting in more power. Kit includes: Two Air Filters, GYTR base plate, GYTR Air filter cage, Cycra Airbox cover (more volume due to taller air filter), and all the necessary mounting hardware. I have been using the Twin Air Powerflow kit for the past couple years with great results, but have found out from you all that it is a little pricey after seeing that No Toil and GYTR makes kits for half the price.
I installed the GYTR Air Flow kit in about 30 minutes as the kit comes with detailed instructions. You will have to use the stock spacers that go inside the stock base plate. Those same spacers will be used with the GYTR base plate as well. I like that the kit comes with two GYTR filters as your stock filters will be null and void once you transfer over the the GYTR kit. You can also use the Twin Air Power Flow filters in conjunction with this GYTR kit if you’re in a pinch and need a couple more filters to have on hand.
The big differences between the GYTR kit and the Twin Air kit is that the GYTR uses plastic base plate/cage parts and Twin Air uses anodized aluminum base plate and cage pieces. The Twin Air kit is a little more “clean” looking, but both are essentially trying to give you more air volume for more power. Your flavor or your money should be directed to what materials you prefer. Some riders like the aluminum feel/look and some riders just want the performance aspect without the feel/look of the aluminum. There really is no argument on which gives you more power because I can’t feel the difference between the two.
But what about that performance? What are you getting with the GYTR kit? You will be getting a louder intake noise, so just now that going in. If you think the YZ250/450F is loud with the stock filter, you need to know that you will be getting more suction and a louder high RPM noise coming from underneath you. To me it’s not that much louder, but it’s definitely a noticeable change. You can feel the quicker low end RPM response as the YZ450F will rev a little freer and quicker than without the GYTR Air Flow Kit. You will also get more mid range pulling power with a gain in top end/over-rev. On the dyno, the claims read that you will be getting a full horsepower more than the stock system. ONE FULL HORSEPOWER is a lot! Sometimes you can’t even get one horse with an aftermarket muffler! Air flow is key with this bike and the GYR Air Flow Kit delivers! Now you might be saying no one needs more ponies with the YZ450F and you would be almost correct. Almost. I DO NOT need more low end power from the 450F, but stretching out some mid range and top end are huge when coming out of corners in second gear. I can feel the YZ450F pull a little farther down the track with this GYTR kit and that allows me even more freedom with my shifting points. If it was me, I would rather purchase this kit over an aftermarket muffler any day!
The GYTR as well as the Twin Air filter seals better than the stock filter so sucking dirt is less of an issue! I will say you have to be more careful when taking the GYTR filter system off because there is no backfire screen to catch dirt particles. I lay my bike on its side before taking off a dirty air filter. That way if any fall down my air boot, it’s likely to only fall close to the opening, which will be a lot easier to get out than digging it out deep into my throttle body. The GYTR Air Filter kit works and is less expensive than the Twin Air, but I still prefer Twin Air’s aluminum sturdy parts. To each his own! You can get the GYTR Air Flow Kit for $150.00 bucks over at shopyamaha.com.