Exhuast System-- I am replacing it

Hello,
I am going to be replacing an exhaust system on
a 91 jetta..... 1.6l...........
Couple of questions....
1.) I am new to volkswagen......
what is up with these C-clips on
the exhaust system at the header pipe
to the exhaust manifold......... Is there
a special tool for their installation....
and should I replace them with new ones..
2.) Did the original exhaust have a resonator?
It is not the turbo... (so no cat)....
3.) where is the best prices for an exhaust...
and do I have to pay alot for that muffler?
I want a good system(that is quiet)
Thanks, Micky..