I got the C&L 76mm MAF with their truflow inlet pipe and a 9" K&N conical filter. It also came with a plastic "heat shield" but i dont' think it does much since it doesn't completely seal the filter off from the engine bay. The K&N is still in the same spot as the stock filter, just mostly blocked off from the engine bay. Bought it off ebay for $260 I think. or was it $160? I dunno. Whatever sounds more correct.
When I bought it, I had ZERO mods done to the car. It was COMPLETELY stock, right down to the air silencer lol. I seriously doubt I gained 10rwhp. Maybe like 5 or so. It didn't FEEL like 10rwhp anyways. But the car did seem to pull more in the upper rpms (4500 +). I am not disappointed, because I know once I do some more work to the engine (intake, heads, etc.) it will show it's true worth. I think if I did it over again I'd get underdrive pulleys and rear gears first - but I'm getting those in the spring so it's all good.
BTW, from what I've heard, if you get the MAF, u should either mount it INSIDE the federwell, or put the air filter directlly in front of it. Like StangTtops said, if there is a bend, the airflow is altered and it will read wrong. Also make sure you get a meter calibrated for ur injector size. Stock GT's (at least the 94/95's) have 19lb injectors