ok first of all I got an 06 with only a jwt intake my next question is which mod will I get me a bigger gain. An emanage ultimate / blue or test pipes and a 5/16 spacer?

 

spacer/pipes for sure. No doubt. do it now.

 

what is the difference between the blue and the ultimate? should i get it after spacer and test pipes?

 

e blue is a piece of junk.

 

what's the difference between the 5/16 iso and the non-iso?

 

going back to your stock intake would be recommended...and free. As for engine mgmt, if new is out of the question, pick up a used utec. No wiring to worry about and its far easier to tune than anything "emanage"

you can read about the differences between the iso and non iso right on motordynes site