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Why don't aftermarket / HFCs have a pre-cat, then?
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03-01-2012, 10:53 PM
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#1 (permalink) |
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A True Z Fanatic
Join Date: Jul 2010
Location: Virginia
Posts: 1,134
Drives: 2009 Touring Sp Nav
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Why don't aftermarket / HFCs have a pre-cat, then?
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2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black |
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03-01-2012, 11:39 PM
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#2 (permalink) | |
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A True Z Fanatic
Join Date: Jun 2010
Location: SWMO
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Quote:
pre-cats, or "pup" catalytic converters are there to reduce emissions before the catalytic converters heat up. The down stream 02 sensors aren't heated up and working at this point, either, so it wont throw a CEL if they are missing, and noone (meaning not me) really gives a **** about preventing the tiny bit of pollution experienced before the main cats achieve light off, and eliminating them reduces restriction to flow. |
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