A word of caution regarding the Torque Tech system being used with a rat motor. I did that, and it will take a bit of work to get it to fit correctly, due to the motor mounting issue. On BB Camaros, the engine sits on an angle, and as a result the header angle (at least on the Hooker Comp's that I was running) is not parallel with the centerline of the vehicle. As a result, you'll need to bend at least one of the pipes to make it fit. The pipes assume an engine that is mounted straight relative to the car centerline. I also used the larger case Flowmasters with this kit, it is tight and you need to do some clipping and welding, but I could make them fit.
I now have a small block in my car and have switched to the 2.5" Flowmaster kit. I wouldn't trade the Flowmaster sound, I personally love the "mechanical" nature of the mufflers versus the "wool scarf" sound of many of the other mufflers I have used in the past (most notably Borla's, hate 'em).
I have my TTech and Flowmaster setup still, taking up room in my garage, I'll sell it cheap. If you are interested, shoot me an e-mail. I can send pictures, etc.
69 SS, ZZ430 Look-alike, Tremec TKO, Hotchkis Suspension