Focus Fanatics - View Single Post - Cat delete pipe for 2002 ford focus
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Old 01-14-2013, 06:44 PM   #22
focusmaniaczx3
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Quote:
Originally Posted by ah1f39 View Post
For those stating that by removing the cat you will loose power are clueless. You gain power by removing restriction. Either get a tune that turns off the rear o2 sensor or install an o2 cheater to trick the ECU.

Please do some research before giving others advice.

Catalytic converters need to reach and maintain a certain temp to work. That is why they are positioned close to the engine. Moving them further from the engine renders them useless.
X2 on this. there may be a reason that the zetec and svt focus both regularly perform BEST in open header configuration on the dyno and at the track. the less restrictive you can make the exhaust the more power you will make.
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