Hi, has anyone done testing on open filters v original airboxes properly ducted? To reduce noise for track days ive been thinking about fitting the original airbox and if i did what is the best size ducting to use? Also what is optimal diameter exhaust size for headers and the end of the collector as I am wondering if mine is restrictive as it is smaller than the original R1 silencer inlet diameter.
Thanks

[Edited on 13/2/10 by bassett]

What MY of R1 are we talking about here? 2003 or earlier or 2004+? They're very different...

Its a fuel injected 2002-3 5PW

Nothing proven but on my 2003 5PW i had a TTS air filter. Sounded great, reved like crazy.
Decided that Mr Yamaha must have spent some ££ designing the R1 airbox, so fitted one.
I turned it round 180deg, cut a hole in the bonnet to make it fit & made sure longer trumpets were fitted to ports 1 & 2.

The difference was very noticeable, i now have more torque. In second and third gears i can really feel it pulling me into my seat. Others i have spoken to have said this is the way forward.

HTH