TwinTurbo.NET: Nissan 300ZX forum - Exactly
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Subject Exactly
     
Posted by jschrauwen on July 09, 2008 at 5:29 PM
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In Reply To You are correct. The TP itself should taper down to 2.5" posted by Z_Cherub on July 09, 2008 at 11:49 AM
     
Message The downpipe will be 3" and the beginnings of the testpipe will also be 3". Depending on the make of the testpipe, the step down to 2.5" will occur somewhere near the tail end of the testpipe. In the set I have, there are small resonators near the end of my testpipe that have a 3" inlet but tapers to 2.5" on the outlet and just before the rear flange.
That way you have the flexability to decide on what 2.5" catback you want to marry up to that testpipe.

1990 JDM RHD - Stage X
491.0 RWHP, 476.1 RWTQ, 18 PSI, Pump gas
26PSI w/Race gas = ???

     
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