Quote:
Originally posted by 98sr20ve
Our cars resonate at 4-5k and I wonder if that has anything to do with it.
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Where is your cam switching point? Maybe that might have something to do with it.
The more duration you have, the greated the senstitivity to back pressure. Tap your header collector and measure your backpressure. If its more than 2.5 psi you are losing power.
It might have something to do with your cam switch point and intake and exhaust manifold resonance as well, VE is highest near the torque peak.
Genraly so called aftermarket high flow cats don't flow better than stock but I personaly think the Magnaflow ones are better, their shell is actualy designed on a flow bench.
Mike