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late model cats are MUCH more technically advanced than 8-10yrs++ ago. they are restrictive but i would guess u'd only loose a few HP (unless urs has high miles on it cuz they do clog up!). other drawback is noise....cats quiet exhaust. if u punch or replace with pipe ur car WILL get louder, unless thats what u want.
these new hi-flow cats are less restrictive than OEM, and u can see a "few" HP gain over OEM. ya gotta weigh all this stuff!
hasnt anyone actually done this on a late 240..?? krunko, i speak from other import experience (this is my first 240, and its not on the road yet!) but most ive exp are 4cyl FI cars....very similar.
guess...remove or punch out=5-7 HP + noise, possible ECU prob. hi-flow cat=3-5 HP + legal, little chance of ECU prob.
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