Whats the K&N filter model for RD350 Y-Boots? (Not stock airbox)

[raptormeat]

After some brief research, I am leaning towards the RD-700 model as I believe a 2.5" inner diameter is correct.
I see a bunch of sites sella kit that is a Y-boot and K&N filter, but they don't mention what model the filter is/dimensions.

I currently have a UNI filter on the Y-boot, which is fine, the model is UP-4245.

Only interested because I have read the K&N offers better air flow versus the UNIs.
Not sure if that will make anything faster, but maybe its worth a shot.

 

[maxDTM]

RD-700 should certainly work, but those kit listings do appear to use the 5" RD-710 filter. I'd measure how much filter you can cram in there; if it's a tight fit the RD-700 might be a good bet.

 

[jpmobius]

I use K&N part#RC-2600. It has the same inside flange diameter as the stock 350 "Y" boot. This is a tapered filter, and I think it is easier to fit than the straight ones. It will fit in an absolutely stock bike with the air box removed with no other mods. Plus, you can go to your pantry, eat a can of beans (or asparagus, you decide!), and use the can to make an adapter sleeve. The most common can size will be the EXACT right thing!

 

[2_DONE_THE_TON]

Sorry for hijacking the post but is there an advantage to go with a Y boot?why wouldnt one fit 2 pod filters?

 

[raptormeat]

i have been told that a y-boot is how the machine was designed to intake air (less turbulent) than pods.
the pressure waves from pods being fitted directly on the carbs interfere with the reed valve optimum intake er something like that.
ive seen no dyno numbers, but many claim the most power comes from fitting the y boot with a UNI or K&N filter.
so about as much proof as the bible at this point.

 

[jpmobius]

My opinion is that twin filters are pretty much the same performance wise most of the time, at least for max power. Certainly there is no lost power with the y boot that I have seen. Using a y boot definitely is better in the rain. You can definitely use a larger filter, and the general fit of the whole intake is much better. The frame on RD's is pretty close to the carbs and makes for either really small filters or decently sized ones that rub on the frame. K&Ns really don't like being bent out of the way, plus it looks sloppy. The boots are also really easy to install and remove, (If the stock airbox is removed, otherwise it is a real pain) which makes jet changes a lot easier. And, new ones are still available from Yamaha for reasonable money.