So what are the added benefits of the new RBC manifold compared to a 04-05' PRC jdm k20 type r manifold? Is it still beneficial or is the type r different but equal, better, or worse. I know the compression is diff between the 07' SI's engine and the type r but how much of the 23hp difference(197 vs 220) is the due to the RBC intake manifold and is it worth it to replace a type r manifold?


Modified by rokwilder1 at 12:03 AM 12/19/2007

 

the RBC flows more and gives more top end, but the SI is built differently, therefore the gains aren't the same. the PRC gives more midrange than the RBC does.