Quote:
Originally Posted by stichris
lol my bad wasnt reading ahahah well my buddy put el on his 04 sti and he lost atleast 100 2 200 rpm of spool but then again he lives by the cobb ap like 70 % of subie owners do
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I wonder if the EL headers increase lag but help high-end. W/o seeing a before/after dyno graph, it's hard to know.
Additionally, there are so many factors aside from the simply EL vs UEL aspect that would also affect spool. It could be likely EL headers hurt spool just because it means the exhaust gas cools more down the longer path... meaning that the EL headers should probably use a smaller diameter pipe than the shorter UEL headers to keep up velocity and protect the spool properties.