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Single or Dual inlet?
Why are some guys using a single inlet muffler and others are using a dual inlet muffler on the same engine? Sorry if this is a silly question.
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03-01-2003, 04:28 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,334
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It depends on the headers being used. For stock Porsches from the SC up through the 964, Porsche had the two sets of primaries feed into a single crossover pipe, so only one catalytic converter was needed. So, you have only one pipe coming to the muffler, from the cat. For that, you use a single-inlet muffler.
If you go with SSI's, B&B headers, or backdate to early heat exchangers, there's no cat involved, and you need two inlets. The crossover pipe scheme robbed power from the engine in exchange for a less expensive smog setup.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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03-01-2003, 05:00 PM
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Join Date: Jul 2002
Location: Washington DC
Posts: 619
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If one lives in a strict emissions area - should he rule out the use of SSI's or B&B headers?
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03-01-2003, 06:27 PM
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Thanks, now I live in an area with emissions testing as well, but would like to add the flow master that you have discussed in prior posts. I have an '88 911 stock and would like to leave it has a single outlet. Which model do I need, p/n 52580?
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03-01-2003, 07:45 PM
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