Are you saying you bought those without knowing a damn thing about them?....oh well. But yeah, they're stock with resonaters put into them. Basically just straight pipes with little kinks in them to change the sound a bit.
Welp I just heard a pair of those yesterday. Sounds real nice, not too loud but aggresive. I bought them ASAP because of the price, besides once the 351 is done, the whole exhaust setup is going to be upgraded.
The car is coming along... I have almost all the parts I need and I was going to put the engine in this weekend but I got a pretty bad cold so I'll have to wait some more My problem is that the lower and upper intakes were ported but the guy did a 1/2 butt job I will just clean it up a little and I think he didn't remove enough material to cause any real power loss at low RPM range.