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I didn't experience any loss of low end torque after I by-passed the secondary cats on my vehicle. In fact, dyno results later revealed a slight blip in hp when done conjunction with an aftermarket cat-back exhaust . Although some degree of back pressure is essential, keep in mind, at 400 plus cells, the secondary cats are extremely restrictive.
JD
p.s. The weight reduction is a plus also.
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Don't worry … I've got the microfilm.
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