Basically as you open up restrictions on the exhaust you lose tq at the bottom end, and gain HP at the top end.
You have to have a certain amount of restriction in the exhaust to keep your low end torque up.
HP is just a measurement based off torque and RPM. The faster the engine spins, the higher the HP you'll see on your dyno chart (until torque drops off). HP is basically meaningless...torque is the raw data, HP is just a formula based off torque.
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