Thread: headers design
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Old 10-18-2010, 02:27 PM   #17
Homemade WRX
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Join Date: Mar 2003
Chapter/Region: MAIC
Location: Mooresville, NC
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Originally Posted by 2002WRXSTi View Post
I have run 2 different headers since I took off my stock manifold.
First was a QuickTime Completely equal length header.
Seemed to really let the engine breath along with sounding just like a DSM
Main problem was it was weak and leaked like mad

Second one is a Elcheapo off EBAY that Junior took a look at before I put it on. Thought the tubes were a bit small in diameter but I only have a 2.0 so it wouldn't hurt it to much? It is an EL Tri Y style so it has a completely different sound than the Quicktime. However it spooled in the 750 to 1000rpm range quicker than the QTP header
They are both tri-y manifolds. The differences between them are primary and secondary lengths...I'm curious what the differences in primary and secondary well as collector (uppipe section) diameter and length.
Those values will really tell you what RPM (resonance) the manifold was tuned, based on second or third wave reflective value.
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