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Exhaust system on 16V cars

Engine

Vehicle Information: Year: 1981; Engine (size, modifications): 4.5L; Total Mileage: 120,000; Transmission type: Manual;

The problem that I am experiencing is with my exhaust. I replaced the rear muffler from the cat back with a straight 2 1/2 inch pipe and an aftermarket muffler but it seems that the car now lost power. I am thinking that the car lost some back pressure therefore the loss of power, could this be true? Should I put back an original exhaust from the cat back, or what do you recommend to do in order to get more horsepower out of the engine. My car is a 1981 928s, 5spd do you know how much horsepower they came with stock? .

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