The 93-95 cars are in a "rough spot" for the DIY tuner, since there is no cheap solution for datalogging like there is for the 96-98 cars (obd2)
Since you cannot effectively datalog an eec 4 car it makes it very hard to fine tune a calibration.
There is tweecer (
www.tweecer.com) that will datalog an eec4 car.. only drawback is your paying 650 dollars for a datalogging solution.
The best bang for the buck, would be to get a tune from a known and trusted vendor such as Lonnie At Blue Oval Chips, he can put together a very good tune for you, based on his extensive experience with these cars.
If you had an obd2 car I'd just say get an Xcal 2 and the PRP pacakage and "tune it yourself".. but. I had a very very long hard fought battle tuning my eec 4 car with no datalogging solution, it took literally 2 years and over 2000 dragstrip passes to get it "dialed in".
Then once I got an obd2 car, and could datalog it. I saw exactly how much performance AND economy that my first tune had left on the table.
I've got a rock solid 93-95 tune for the first gen mark 8, and I'm just now putting the finishing touches on my 98LSC tune.. the datalogging sure was an "eye opener".
SCT is by far the best tuning solution out there, I only wish they had released the "datalogging chip" they advertised about 5 years ago.. it's a shame it never made it to production.. as it left a HUGE GAP in the Mark 8 tuning world.