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Stock Downpipe Size


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#1 Impeccatus

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Posted 29 October 2004 - 04:05 PM

Pardon me but I'm confused about why 2.5" downpipes are sold if te stock one is 2.5 already.

Or was I misreading that dimension from a recent post .
94 854T, ST chip, K&N, MBC at 6psi
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#2 Turbo Brick

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Posted 29 October 2004 - 04:09 PM

Stock is actually 2.25 IIRC. Also it is crush bent, so in some places it's probably more like 1.75. What you want is a mandrel bent, larger diameter downpipe and exhaust where the diameter of the pipe stays the same through the entire system including the curves.

#3 T-5Bandit

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Posted 29 October 2004 - 04:18 PM

QUOTE(Turbo Brick @ Oct 29 2004, 04:09 PM)
Stock is actually 2.25 IIRC.  Also it is crush bent, so in some places it's probably more like 1.75.  What you want is a mandrel bent, larger diameter downpipe and exhaust where the diameter of the pipe stays the same through the entire system including the curves.
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Stock isn't crush-bent.
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#4 Turbo Brick

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Posted 29 October 2004 - 04:24 PM

QUOTE(T-5Bandit @ Oct 29 2004, 12:18 PM)
QUOTE(Turbo Brick @ Oct 29 2004, 04:09 PM)
Stock is actually 2.25 IIRC.  Also it is crush bent, so in some places it's probably more like 1.75.  What you want is a mandrel bent, larger diameter downpipe and exhaust where the diameter of the pipe stays the same through the entire system including the curves.
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Stock isn't crush-bent.
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Then what is it?

#5 TurboBruce

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Posted 29 October 2004 - 04:35 PM

When I took my car to he muffler shop to have a Magnaflow put on I asked him if he could do a better job then what was there. He said no way!! Volvo exhausts are not as restrictive as other stock cars. I will have then install the magnaflow muffler but will use mandrel bend off the muffler.

The guy also measured the pipe with a Micrometer(I Think that is what it is?) and it measured 2 3/8. I will go this route for now and If i do infact put on an 18t then I will go with a complete mandrel system. I will look into a highflow cat as well as long as it will pass smog.

Edited by TurboBruce, 29 October 2004 - 04:36 PM.


#6 Impeccatus

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Posted 29 October 2004 - 04:47 PM

Again with the 18t - seems to be getting more press than ever. It used to be all 19t talk....
94 854T, ST chip, K&N, MBC at 6psi
Red w/anthracite Titans

"All that is mortal is but a sign". Goethe




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