2.5 Roush w xpipe vs same setup w 3 inch cutouts how much power am I leaving on the table (boosted)

[Mike K.]

I’m going boosted with an lpf turbo kit which will replace the cats anyways and I already have a 2.5 inch xpipe/ Roush quad setup.

Was thinking of adding qtp cutouts that are 3 inch but because of space issues and maintenance issues on them was wondering how much power I’m leaving on the table ?

Thus is gonna be purely a street car looking for 700-750 to the wheels but you never know as I might wanna turn it up one day.

How bad will this 2.5 exhaust hurt me ?

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[Guid.oh]

I would say maybe around 20-25whp in your scenario comparing peak to peak. Most of the lower end of the rpm range will look very similar but beyond 4500-5000rpm the 3 inch setup really begins to shine. The biggest restriction would be the stock manifold and the neck down 2.25 inch pipes but you don’t have to worry about that with a turbo kit

 

[Mike K.]

I would say maybe around 20-25whp in your scenario comparing peak to peak. Most of the lower end of the rpm range will look very similar but beyond 4500-5000rpm the 3 inch setup really begins to shine. The biggest restriction would be the stock manifold and the neck down 2.25 inch pipes but you don’t have to worry about that with a turbo kit

Cool thanks that’s not too bad

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