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Originally Posted by IHateHacks
A test pipe is a 3" straight pipe with toyota flanges that replaces the main catalytic convertor.
And he is right, having a stock cat will keep the loudness down, along with the nasty'ness.
You have a non-turbo so unless it was a cali car when it was sold brand new, you don't have a pre-cat, which is another big time restriction on turbo cars.
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where is the pre cat located.