emissions

This is the first time I'm doing a full race bodywork bike, but the owner wants the stock harness intact. Usually I always go to the Kit ECU and harness. My question is; how many - if any - of the emission systems can I remove without throwing codes? I have a feeling I can pull most stuff...

So, I purchased a gas tank off a 49 state zx10r and was wondering if I can go ahead and install it as long as I get rid of the Kleen air system on the Cali bike. Now the reason I ask is because the thread on how to do the kleen air mod says we should keep the hose(blue line) as a vent, but the...