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Old 08-02-2014, 12:21 PM   #1621 (permalink)
Jsmith7861
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Quote:
Originally Posted by Darketch View Post
So what's the difference between HFCS and test pipes?
Basically, you have the stock cats, right? Think like this.

You have a filter element in the stock cats. The HFC has a smaller filter element, allowing more gasses to get through. The test pipes have NO filter element, so gasses pass through freely.

The cats cause back pressure. Unless you are going FI, you don't want that.
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