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Originally Posted by NJSPEEDER
ditching the cat is worth a bunch of power, my 91RS picked up more than a full mph of trap speed with no other tuning, little g picked up about 2mph of trap speed with appropriate tuning. that is way more than 3hp.
also, the fine in new jersey for failure to maintain your vehicle is $175, and i have never in my life heard of anyone getting it for ditching their cat.
the $10k fine everyoen always talks about is a federal highway fine for illegally disposal or handling of hazardous materials, which if they see teh trash bag of cat guts you can get nailed with, otherwise it is just a failure to properly maintain.
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Well, a high flow cat won't cost you more than 3-5 hp so if you picked up that much then you had some serious previous tuning and maintenance issues that started killing that cat way too soon. I've got some articles showing that dual cats only slowed an 11 second car down .1 in the 1/4 mile. When they compared cats vs mufflers, the mufflers slowed it down by .4 compared to the cats .1 so cats are not restrictive like all you guys like to think they are. Now if you have a lousy factory cat(like the 1990 454SS pickup) then replacing it with a better flowing cat is a no brainer. Now if you leaned your car out too much with tuning then you probably damaged the cat from excessively high exhaust temps.