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ZETEC Performance (2000-2004) The place to chat about any 2.0L Zetec engine performance, tuning and exhaust related upgrades.

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Old 04-02-2013, 03:31 AM   #1
Middleton
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cat vs catless

so i have heard rumors that our motor will not perform as well with long tube header into a test pipe with 2.5 inch flex and 2.5 all the way to an axle back muffler as compared to long tube header into a cat then 2.5 inch catback....is that true? i always thought ORP or test pipe would be more high end power.


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Old 04-02-2013, 11:05 AM   #2
Neiderhiserm
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No cat will perform better with proper tuning, it will also be much louder
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Old 04-03-2013, 03:27 AM   #3
Middleton
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how much louder do you think it will be? any why does it perform better....people say the drop in backpressure can be bad and lose power
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Old 04-03-2013, 04:06 AM   #4
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Old wives tale......................there is no such thing as low enough back pressure in a normally aspirated motor. That thinking is from those who haven't a clue.
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Old 04-03-2013, 09:32 AM   #5
Neiderhiserm
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^that, it performs better because it is less restrictive for the exhaust gases to exit, and for how loud, it all depends on what muffler you have, and if you have a resonator or not. Search the site there are many members who posted clips of what there exhaust sounds like, its hard to describe in just words
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Old 04-03-2013, 11:17 AM   #6
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Load. Did this at first and sounded horrible to the point I purposely drove slow because the sound was too irritating. I added the longtube header to an already deleted resonator though. Plan on upgrading exhaust after the header install but it is fun to asshat around with an obnoxiously loud exhaust sometimes.
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