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gutting the cat of a nissan will only drop you around 0.1 second on the 1/4 mile and isnt the best thing for the environment (I'm not a hippie tho) I just think its really useless since nissan cats are pretty highflowing already.
I would go with buying used upgrades from the classifieds on this site and our sr20 counterpart. You can probably get a header and intake for 300 dollars and possibly an exhaust with the extra 200...
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