A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
The most constriction happens in the front, at the pre heated cat, the next cat, and the insulated pipe between them. So i would not expect any speed
By removing the broken cat no 1, changing the insulated pipe for a wider one, and swapping the constricted cat no 2 for a better flowing one, I can feel some improvement. But most of it is the 1.6 engine.
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