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Re: Straight pipe instead of new CAT
aftermarket high flow cats start around $50. Assuming its a replaceable type cat, I can't say there's a good reason not to just replace it.
btw, if you do gut the cat (or replace it with a straight pipe) the check engine light will come on and stay on.
And also: badly burned out cat like you discribe, usually points towards a long term runability issue, such as misfires
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life begins at 10psi of boost
Three turbo'd motorcycles and counting.
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