Removing the cat

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500, 472, 425, 368 Discussion, Removing the cat in Cadillac Engine Technical Discussion; I've been looking into 425 cars lately, I like the DeVilles alot from this era. I read the whole "cheap ...
  1. #1
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
    Join Date
    Jan 2005
    River Falls, WI

    Removing the cat

    I've been looking into 425 cars lately, I like the DeVilles alot from this era. I read the whole "cheap 425 power upgrades" thread, but didn't get a great answer on just how much power removing the cat from a 425 car frees up. It seems like the 472/500 manifold and removing the cat are the two biggies as far as cheap upgrades, am I correct? What is a stock 425 rated at, HP and torque?

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  3. #2
    davesdeville's Avatar
    davesdeville is offline Banned
    Automobile(s): 1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
    Join Date
    Aug 2003
    Albuquerque, NM

    Re: Removing the cat

    Stock 425 4bbl is rated at 180hp/320ft.lbs. A center-cut 472/500 intake manifold might be worth anywhere from 10-20ish. Gutting the cat I'd say would be worth similar gains or better. Doing a nice true dual system would be the best of course.

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