yea what matthewstetz said, its in the ECU and you need to remove it with a chip. Wayne is one of the best tuners and has great customer service. Not the only but i strongly recommend as ive had nothing but positive experience ordering thru him.
think of a chip but instead of installing it on the ecu, then whenever u need to make a change u have to remove, reprogram, and re-install...the x-cal just plugs into ur obd-ii port and reflashes the ecu...its a lot faster and a lot easier to deal w...and besides...how often do u plan on running up to 110 mph and/or 6850 (?) rpms?
Well, @ $400 it will be awhile b4 I go for all that madness. I spent so much $$ on my Foci in the last 7 months, I gotta restock on dollas. & I almost hate to spend so much money on something that really isn't gonna make a 2.0 much faster, it's just not a fast motor. Unless of course it's completely tweeked to the max, thousands of $. I seen one in Super Street National that was 400 bhp. But who has that cash.
you have a decent amount of mods, a tune would definitly free up alot of power still there, your throttle response would be better, and the car will just feel alot smoother too. Definitly get a tune since you got that many mods. Youl notice a difference after it.