Hi all,

I have the oppertunity to purchase a Yamaha XT660Z "Stage 2 DNA Air filer and cover & Stage 3 Fuel Mod + O2 Controller". Seems like a good deal.

At the same time, Ill be honest, this filter buisiness with the seperate stages is confusing me a little - from what I have read this set will give a decent performance boost, but can I add any other filter elements to the bike along side it, should I?

As I understood the stage 3 set replaces the entire airbox - how then can you use a stage 2, that sits inside the OEM airbox and 3 together?

Cheers!