You should check out the Technical and Modifications section of the forum.
There are some great threads in there about all the different mods you could make.

If you looked at a couple of the threads, you would get a pretty good feel for what's available on the Crossfire.

This thread is about going with a larger throttle body for improved throttle response, and a dribble more power. This one works best with larger injectors, and a higher flowing air intake system:

https://www.crossfireforum.org/forum...y-upgrade.html

This thread here is all about what the different mods offer, and what the part numbers and costs would be:

https://www.crossfireforum.org/forum...ing-depth.html

Have fun researching!

BC.