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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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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