You're right about the build quality. The thing is that they're still pretty damned good. And then you factor in the low price, you've got great value.
As for the quiet part, you must be talking about the "Stealth" canister becaus ethe "Race" canister is LOUD!
I am 99% positive they make a half system. I'm talking about a canister and the elbow. It just slips onto the outlet of the stock header. There are many advantages to this set up and I'd never buy the full system.
Advantages:
Excellent header is not scrapped. Ti, excellently designed, why would you want to replace it???
Very easy installation.
Saves weight.
Costs less.
Looks good.
I wish they made this half system with a Ti elbow and canister. Then I could have a full Ti system.
Oh yeah, I held the stock Ti header and my SS Yosh header in each hand. I'd guess the stocker is about half the weight...
"Ask not what your bike can do for you,
ask what you can do for your bike"