I'm not disagreeing with xfiring regarding the natural progression being chip, then exhaust.

On previous cars I've chipped, they've recommended doing the chip after everything else.
This way the chip is programmed to take into account everything else you've had done - i.e.) a 'one-off' for each individual car.

It sounds to me like the chips for Xfires are just an 'off the shelf' program.
I haven't fully researched them.
Of all the companies out there that do chips, they all state the same hp & torque gains.

Just a thought!