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how about this, i know of 3 dyno graphs, granted this is on a race car, however it shows 3 things
header, catback, muffler, lowest hp and torque
header, catback, no muffler, showed gains at all rpms, in both hp and torque
header, no catback, no muffler, showed gains at all rpms above the dyno with the catback, in both hp and torque, almost 20 more hp vs the first dyno with muffler and catback
car was a dodge neon, with a properly contructed long tube header, to the stock cat, with 2.5" piping i believe (2.25" stock), stock muffler.
i'll try to find those dynos again and post them, if i can get persmission
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