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On my 2001 GSR the 4-1 DC ceramic dynoed at almost 7 more hp and 5 more ft.lbs of torque at 6600 rpms, and had a significant gain all throughout VTEC. Low end stayed pretty much the same with a few small gains here and there. This was compared to a 4-2-1 DC ceramic. The 4-1 made a very large difference in power and times at the track. Only other mods were Apex N1 catback, AEM CAI, and a Apex V-AFC.

Later, Chris running a 4-1 on the neon with 2.25 inch primaries and 3 inch merge collector..........but it makes big power.
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