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in a tuned exhaust you use unequal length pipes and a specific back pressure to facilitate exhaust gas scouring and increase torque at low rpm.
equal length pipes and reduced back pressure (high flow mufflers, cat delete) will improve large volume air flow and increase hp at high rpm.
so, you increase high rpm hp at the sacrifice of low rpm torque. i have yet to find a dyno of an aftermarket exhuast that didn't make less torque than stock in the 2500-ish rpm range.
porsche decided that most folks drive in the low to mid rpm range and designed the exhaust accordingly. ask yourself how often you really run your car over 6000 rpm vs how often you are tooling around at 2000 to 4000 rpm. that should dictate whether the cat delete will be of any benefit.
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