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on a standard cat back it will do very little, except make the car idle erratically. this is the main reason why k-tec scrapped their off the shelf decat and now sell a sports cat, and why the decat is question was a custom made one.
well compared to standard it idled slightly erratically with just a 200cpsi sports cat on it, so cant comment on that.
however you have to think, k-tec could have made considerably more money from selling decats than from selling sports cats. but they found it made it more erratic so have had to sell just sports cat. so i doubt they would intentionally do themselves out of some revenue.