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Originally Posted by someguy_240
the second cat? you talking about the s14 right? The s14's dont have a second cat. Its hollow! have you never took that thing out
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Ummm no. YMMV, but on my 96 auto the primary (smaller on near the manifold) AND the secondary (big flatter one) BOTH are active cats.
Anyway, I've gone with Hotshot headers, Magnaflow 2.5" hiflow cat, and HKS HiPower catback. I welded in the appropriate O2 sensor bungs to keep the OBD happy and use the second Hotshot sensor bung for an AF meter. The intake side has an Injen CAI minus the extension. Butt dyno tells me there a significant HP increase over 3400 RPM, and it runs right up to the rev limiter now (used to tail off about 600 RPM short).
Don Nimi offers a bolt in hiflow cat through his PDM Racing site, if you want to "keep it legal"
l8r
Dan