You can have your stock manifold downpipe flange weled on the ported w-body rear manifold since it'* steel. That'* probably the easies thing to do. OR if your getting a 2.5" mandrel DP made then have them weld on the correct flange.
Stock i think it shifts at 5900 or 5800 i forget. You need a chip to raise shift points. But you should only raise them if your doing mods to raise your powerband (rockers/exhaustor most importantly, cam)
Not sure where you speed limiter is 113mph? i dunno test it
The best page for engine parts?
intense, zzp, and where they sell I Win 1.9 rockers?
You can find out alot of info on there about the products and you can save money by getting used parts at www.clubgp.com
in the classifieds.
What does my car run?
I dunno i'm workin out the bugs still before i go to the track.
I've got a se with the SLE package with black leather and less buttons than you :(