I am still using the Link Box right now that comes with the kit, but when I get my built internals I will be moving to Hondata and capping the secondary injectors.

The engine management is probably going to run you anywhere between 500-1500 depending on what you go with.

The link box can be tuned pretty good as long as you stay within its parameters.

The street legal kit comes with the EMS and the same turbo as used on the open track kit. And you will probably see better than 250hp at 18psi, more like 265 whp.