Twin scroll vs twin turbo

SS_Firehawk

And this is why this forum rocks. Thanks for the insight.

Something that's very important but often overlooked when talking about headers, is it's actual length and if they are tuned to the rpm of the motor. The longer the exhaust header, the greater the low end torque, but at the cost of high rpm power because it loses efficiency. This also implies that the shorter they are, the more efficient at high rpm, but at a loss of low end tq. The diameter of the pipe will also affect the low end if they are too large. The PPE's I have are stepped 1 7/8" to 1 3/4" and back to 1 7/8". The merge collector is at a shorter distance to the motor than F.I's. PPE says they are tuned headers, so I'm assuming they put the collector there for a reason, ran the rest at 2.5" to the Y pipe.

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