Differenced between HFC and Testpipe
Differenced between HFC and Testpipe
I was wondering what the differences in performance and sound wise there is between a HFC (metal substrate) and a resonated test pipe. I assume HFC will pass emissions with no problem yes? Any insight would be most helpful. Thanks!
Not too much difference in sound....a little, but not a lot.
All HFC might not pass emissions. It all depends.....the good HFC's will not pass emissions and will throw a cell. If you get a HFC that DOES pass emissions, that also means it is restrictive and robbing horsepower.
On my VIII I ran an HFC for a year and did not pass emissions. I said F it, if I am not going to pass emissions, I might as well get a test pipe, so I did. I don't bother with HFC's anymore. There is no guarantee they will pass anyway.
All HFC might not pass emissions. It all depends.....the good HFC's will not pass emissions and will throw a cell. If you get a HFC that DOES pass emissions, that also means it is restrictive and robbing horsepower.
On my VIII I ran an HFC for a year and did not pass emissions. I said F it, if I am not going to pass emissions, I might as well get a test pipe, so I did. I don't bother with HFC's anymore. There is no guarantee they will pass anyway.
I got the HFC because I was told it cuts down on the smell ... I'm not worried about it passing emissions because I'm pretty sure the rest of my car wouldn't pass a real emissions inspection anyway lol
Yes it will. Cats in N/A cars don't make much difference, but with a turbo...the difference is huge! Personally, I would go with the test pipe. Just bolt your old cat on for emissions. Also remember, if you have a new car you will not be required to do emissions for 3 years (at least where I live). I haven't done emissions on my 2006 Evo yet.
BTW, you can still fail emissions with a HFC (and/or have a CEL) and it will still smell a little, but it is the "more" legal approach. With a test pipe, your car will smell like a go-kart or a lawnmower.
BTW, you can still fail emissions with a HFC (and/or have a CEL) and it will still smell a little, but it is the "more" legal approach. With a test pipe, your car will smell like a go-kart or a lawnmower.
