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-   -   Replacing Both Primary and Secondary on 1990C4 (http://forums.pelicanparts.com/porsche-964-993-technical-forum/289329-replacing-both-primary-secondary-1990c4.html)

c4go 06-20-2006 06:34 AM
Replacing Both Primary and Secondary on 1990C4
 
I would like to know if both Mufflers were to be "by-passed" can it still be drivable ...what are the down sides besides Noise?
Is there still enough backpressure?
Help!!! :confused: :confused:

Britwrench 06-20-2006 11:56 AM
I would only replace the rear (center) muffler with a cup by-pass pipe, otherwise it's way too noisy and resonates in the car.

Bill Verburg 06-20-2006 12:45 PM
<pre>Section Flow Rate (CFM)
Catalytic Converter 442
Primary Muffler 396
Secondary Muffler 462
</pre>

here are some #s that backup Britwrenchs suggestion


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