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Discussion Starter #1
I heard the stock diameter exhaust ppipe on 240Z's was 1-3/4 diameter. i took a caliper gauge under and my "stock" pipe measured at 1-5/8.

now either someone put even smaller pipe on it or it came like this which i find awfully small to be stock. it looks like when we cut the resonator off it was like 2" to that from the header, and then they shoved it down to the 1-5/8 after that all the way to the muffler.

so was the stock pipe 1-3/4?
 

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Discussion Starter #3
yea it is **** small. we will be at the muffler shop today getting 2.5 inch pipe and a magnaflow muffler.

should make an improvement in sound and i would think a couple HP more at least also
 

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maybe it was a metric size????? I dunno i have never stopped to measure I just cut 'em off.......
 

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Brian, I have an original 73 and it measures 1 5/8
 

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Discussion Starter #7
just got the 2.5 inch on and a flowmaster 40 series delta flow muffler. WOW what a difference in sound and power.
 
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