Helix up-pipe (thoes who own it) - Subaru WRX Forum
 
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post #1 of 2 Old 01-27-2006, 12:09 PM Thread Starter
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Helix up-pipe (thoes who own it)

i know that an up-pipe is an up-pipe, and the the only real important thing is keeping a 1.62" internal diameter. wiht that said the Helix offering advertises a 2.25" diameter. this is quite a difference.

however, uppon closer inpection of the picture on www.gruppe-s.com, it appears to taper as it get closer to the turbine flange.

can thoes of you who own this piece either confirm or deny the taper of the upper (after flex) section?
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post #2 of 2 Old 01-27-2006, 07:08 PM
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I am pretty sure that the 2.25" diameter is the OD, not the ID. The diameter is only slightly bigger then the stock uppipe. I am unable to confirm the tapering of the uppipe however.
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