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Discussion Starter · #1 ·
The DC sport header ( not race ) made for 02 -05 SI and RSX-S has two verisons : SS and Ceramic Coated. Well the area inside collector on the SS is larger than Ceramic, which gives the SS a higher flowing colector and exit.

The exit inside dia of the SS is just under 2.5", which is split in half by a divider plate to form 4-2. The ceramic exit inside dia is far less than SS.

Maybe others knew I didn't, and found out today after comparing the one on my car to the Cermamic coated one.

If this is the header you choose , choose the SS= better flowing collector.
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