Supercharged X pipe size

[DrDane]

Im shortly to install my paxton setup.

I ordered the FRPP x pipe, because I read it was 2.75" and not 2.5", wanted biggest tube size to minimize restriction while they gasses are still hot, but wasn't willing to spend the few hundred extra for the name brand 3".

I might have my hands on a 3" x-pipe, question is does it really matter if I run this extra 2' of tube as 3" vs 2.5" past my headers, before necking down to the 2.5" exhaust thats behind the resonators.

If the cost is a non issue any reason not to use the 3"?

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[Rebellion]

Im shortly to install my paxton setup.

I ordered the FRPP x pipe, because I read it was 2.75" and not 2.5", wanted biggest tube size to minimize restriction while they gasses are still hot, but wasn't willing to spend the few hundred extra for the name brand 3".

I might have my hands on a 3" x-pipe, question is does it really matter if I run this extra 2' of tube as 3" vs 2.5" past my headers, before necking down to the 2.5" exhaust thats behind the resonators.

If the cost is a non issue any reason not to use the 3"?

In theory, your effective diameter would be the narrowest pipe in the line (after the collectors obviously). I don't think adding a small section of 3" in a 2.5" system would be of significant gain, at least in theory.

 

[DrDane]

In theory, your effective diameter would be the narrowest pipe in the line (after the collectors obviously). I don't think adding a small section of 3" in a 2.5" system would be of significant gain, at least in theory.

I thought same thing, but since the gases cool as they flow and the pressure/resistance drops. Does this mean anything for power, probably not maybe 1hp difference out of 800, but just curious if there is any down side? I can't think of any and I need to neck down the 3" to 2.5" regardless.

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