Questions on exhaust for newb, was curious Options

[DrifterJay]

ok, I am a total newb when it comes to Porsches... I have been converting from Hondas and other japanese crap to something better. Explain how the exhaust system works. Like the heat exchangers and other bs. Also when someone gets a header system, does that remove the heat exchangers? Also, what compromises the 914 exhaust? Is there an 02 sensor, cat converter and such? Or is it a straight pipe. Keep in mind I will be getting a 72 1.7...Basically..from motor to tailpipe what is there. lol. Also, I have examined the car I am to be purchasing soon and rust is minimal..very little battery tray corrosion. Well the car has a old aftermarket exhaust system with dual outlets. In fact..its something like this 00 00. If that makes sense. I think the heat exchangers are there on it..I see all this tin around the exhaust. Are those the exhangers? Could someone post a pic of the exhaust with exchangers so I know what to look for? Also, should I change that exhaust to a single outlet, for reasons of too much backpressure loss? Ok thats a ton to digest..sorry for the long post. Oh yes, one more, what kind of exhaust is this?

THANX

Jared (IMG:style_emoticons/default/wink.gif)