you can't run glasspack mufflers after a cat as the cat makes the exhaust too hot and will destory the fiberglass in the glasspack muffler, you would need to make test pipes and bypass the Cats or you will be replacing glasspacs quite often.
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Back after many years.
2003 F250 CC LB 4x4 7.3PSD
Minotaur user.
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