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foxrider300
07-06-2004, 09:24 AM
How Much Power Does a K&N Filter Give Out??? for a 400ex
cals400ex
07-06-2004, 10:36 AM
i say nothing you would notice. i have used K&N, uni, twin air, and stock air filters. i wasn't able to tell a performance gain with any of them. my jetting changed very very little if any at all with these filters. however, i do my testing drag racing. my 406 runs just as quick with the stock filter as it does with the K&N. on the other hand, removing the air box lid actually does make a difference in jetting. you won't notice much even if you remove it though and rejet.
Evan400ex
07-06-2004, 02:48 PM
I have to say that K&N's do give better throttle response. I tried out the UNI filter about two weeks ago and took it off after the first ride. The K&N was overall alot better flowing filter. Just make sure you put a prefilter over the K&N if you ride in dusty conditions.
04'400ex'er
07-06-2004, 09:01 PM
The K&N gives slightly more throttle response on a stock machine. With the jetting changes I made, taking off the Air Box lid, and removing my baffle, there was noticeable power, but nothing to brag about. Maybe 1 bike length in a drag race at the most.
400exKy1e
07-07-2004, 08:38 PM
i have an air box lid with about half of it cut out, when i go to the track should i use outerwears or not?
TC426EX
07-07-2004, 09:19 PM
ALWAYS use an Outerwears with a K+N PERIOD!!
04'400ex'er
07-07-2004, 10:59 PM
Originally posted by TC426EX
ALWAYS use an Outerwears with a K+N PERIOD!! I'll second. I have no lid, and no prob with the outerwears on.
LaSalleKid
07-08-2004, 12:21 AM
I run a different bike but I still have to say the jetting helps out tremendously powerwise. Havent been able to find a K&N Filter yet, they stay out of stock, but if were to buy any filter it would def. be a K&N. I also run w/o a lid. :cool:
Toadz400
07-08-2004, 01:03 AM
Originally posted by LaSalleKid
I run a different bike but I still have to say the jetting helps out tremendously powerwise. Havent been able to find a K&N Filter yet, they stay out of stock, but if were to buy any filter it would def. be a K&N. I also run w/o a lid. :cool:

Could you tell me why you would definately run a K&N?
LaSalleKid
07-08-2004, 01:56 PM
They are the best me and my buds have came across, and we have tried %99.9 of all air filters.