A high flow cat will outflow most of those brand mufflers until you get into their "race" mufflers which most likely won't pass noise inspection. Tests have shown that running dual high flow cats will actually make more torque than no cats at all and only cost around 2-5 hp vs no cats.
Here's from a test:
Quote:
Chevy High Performance Magazine
LT1 Power Play covered a series of dyno tests using a 460-horsepower 396 cubic inch LT1 engine. With open exhaust, the engine produced 457 lbs/ft of torque and 455 horsepower. With Random Technology Super High Flow catalytic converters, the engine cranked out 455 lbs/ft of torque and 458 horsepower.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
Last edited by JL8Jeff; 02-24-2006 at 05:54 PM.
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