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Re: Magnaflow XL mufflers - yay or nay?
The free flowing design of mufflers like Magnaflow, Borla, & Corsa tend to give up some low speed torque for higher end horsepower gains. I noticed a similar(not as much as you describe) loss in torque when I switched from Flowmaster to Magnaflows on my truck. It seemed as if I'd lost some of the low speed pep, but in the upper rpm ranges it really soared.
It sounds as if you have very little restriction in the exhaust system which reduced the backpressure. Before blaming the exhaust, look into re-tuning the engine some. You probably tuned the engine to run it's best with the exhaust system it had. Start with bumping the timing, read your plugs to see how the carb is mixing A/F, readjust the idle mixture screws, etc.
An engine is essentially just an air pump. It sucks in air, and pumps it back out. When you change the levels on which this happens(better flowing exhaust) it can change the amount of air it needs to intake to exhale according to what it's capable of.
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