+2 on the NightRider XiED's - plug 'em in and forget 'em.
I went with the ViED version (adjustable) - my oil temps dropped by 25° instantly and the decel popping I had after adding new pipes all but vanished.
And the bike runs better too...

The V&H FuelPak and FuelMoto MicroTuner are just more expensive options that do essentially the same thing.
All are limited to simply adjusting your AFR.

 

You will have quite a few different options, depending on what kind of money you would like to spend. I have attached a link to a different thread where Kevin outlines all the different types of tuners you can get. The simplest and less expensive option is the XIED or VIED. You can read more about them HERE.

FORUM LINK

 

What would you recommend for an 05 Standard EFI, bike has no o2 sensors. Thanks

 

+1- on what he said.

I'll also add, search e-bay and you might score one for $100.

 

The best bang for the buck would be the combination of Xied and FuelPack; that way you get control of both open and closed loop settings on your ECM. Give the guy a call at Nightrider (who makes the Xied), he can 'splain it better than I can...