I haven't heard their axlebacks, but you MUST get their O/R H pipe from Brenspeed. Pypes only sells it through Brenspeed. It will only enhance your sound, and give it a mean growl.
Have you been to the track yet?
Do you have problems hooking the tires?
If no problems hooking, then maybe you would want gears for better e.t.
If you have problems hooking up, then maybe lca's and uca's at the same time.
Install the CAI package and pipes at the same time. That's what I did. I got much better sound and performance at the same time. I had a grin ear to ear the entire day.
I also agree with everyone. CAI and tune.
If you haven't purchased anything yet, check out www.bamachips.com .
You would be very pleased with the results of Doug's tunes on the SCT/XCALII and JLTII CAI.