its really your choice of oils. its just important to keep it changed. im thinking the manual says every 8,000 miles but i personally change mine every 3,000 - 3,500. i wouldnt go 8,000 if you paid me. : )
i have used several different oils. i cant justify spending the money on something like amsoil. my personal choice is the lucas oil semi synthetic 10w40 motorcycle oil. i order it from ebay.
Lucas Oil 10710 High Performance Motorcycle Oil 10W 40 1 Qt Bottles Each | eBay
4 quarts plus shipping is 43$ i can feel the difference in how my 954 shifts using the lucas oil over the honda HP4 and costs about the same. if i can feel the difference on the shift pedal then i know its got to be better in terms of protection. its simply smoother with the lucas oil.
i have also used castrol 4t when in a pinch for money and i have no doubt it does its job and felt fine using it because its my opinion that as long as your keeping up on the oil changes at intervals of 3-3500 miles really any oil is going to do its job fine. however, like i said its a noticeable difference when i put the lucas oil back in so i feel like i can justify the extra 8$ over something like the castrol.
Castrol Actevo x Tra 4T Synthetic Blend Motorcycle Oil 10W40 1 Gallon 3166 | eBay
like i said i have used the honda HP4 as well and its not bad but didnt feel as good as the lucas oil.
honda oem filters are pretty much the standard. they arent expensive. or use a hiflo filtro you can also get on ebay
Oil Filter Honda CBR 600 900 929 954 1000 CB CBF | eBay
or the k&n but i wouldnt suggest anything else.
K N Oil Filter for Honda 954 CBR954RR 2003 | eBay
if your like me and want to keep your oil changed more than 8,000 mile intervals you can get away with changing the filter every other time.
might just consider removing the flapper. i did a good amount of research on the mod before i did it. what i found was no real benefit with it in based on dyno testing the mod and just what others who have done it say. there were a couple benifits to removing it though. the main reason i did it was again less stuff to mess with when im getting under the air box. the second reason for removing it was its less stress on the servo motor that controls the flapper and htev system. there are plastic gears inside the servo motor and removing some of the stress placed on them seemed like a good way to increase its functional lifespan. those benefits coupled with no performance increase with it in justified the mod to me.