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Originally Posted by kias@tampabay.rr.com
Did you modify the exhaust when you installed the EVO/GIAC together? Like headers or removing the 2nd cats?
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Before I did the Evo kit, I already had the Dansk manifold, sports cat and muffer installed. The works as far as exhaust systems are concerned
Dyno tests revealed gains for the manifold and cats but slight loss on the muffler. But I left that on anyway since I kinda like the sound and the torque/bhp loss is not that much...