What kind of cat-back did I just buy?

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 :nonono: My problem is that the lower and upper intakes were ported but the guy did a 1/2 butt job :nonono: 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.

I need to finish my car by next month.