NixxoN

I havn't been able to drive my car yet still have some repairs to do on it but I've been reving it to see if it creates any smoke in the exhaust at certain rpm's, and listening to the sound too I guess :P, and I've noticed that at about 3000-3500 the steering wheel and some of the console starts the jitter abit, I've been around the car and from what I can tell it's not the engine moving about and it's not the exhaust either, it has an aftermarket system and has a hole in it somewhere could it be that? It starts to ease out of the jittering from 3500 to about 4500 when there are no longer any jitters, does that have to do with the secondaries comming online at 3800 that I've read about, I wouldn't think so since it's parked but maby, if not then what is it? and how do I stop it?
Also it starts to put out blue smoke, running rich I guess, at around 5500 RPM's and continues all the way to redline, I'm not sure if it's supposed to do that when you rev it up in neutral or not but it kind of disturbs me that the only thing I can see out of my rear view mirror is blue smoke, can anyone bring light to this subject for me?