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Originally Posted by jhandy
Johnny,
The headers with 100 cell cats are very free flowing and when combined with the secondary delete and the muffler, there was not engough backpressure.
Low end torque was fine with the cat deletes and muffler, the headers where the problem. replaceing the OEM muffler fixed the issues, and it is easier to change than the headers.
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I agree with you in so far as 100 cell cats are a bit too free flowing for street applications . Moreover, the ecu has to be re-mapped in order to avoid CEL's, and keep the vehicle OBD II compliant . With that said, the combination of a freer flowing cat-back , along with deletion of the secondary cats, in my experience reduced back pressure to the extent that low end and mid range torque suffered . This deficiency was remedied by switching to 200 cell cats, along with some exhaust reconfiguring .