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I was just wondering if I should go with 4 inch or if you think that 3.5 inch exhaust would be enough for 2500 hp.

The engine is a 496 bbc with 9.5-1 comp ratio. I have twin gt4788 turbo's for it with the .96 ar exhaust housings so it should spool quickly.

Thanks
 

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Pre turbo 3.5" post turbo 4".
Post turbo back pressure kills.

You may want to look for some larger hotsides too.
 

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I was just wondering if I should go with 4 inch or if you think that 3.5 inch exhaust would be enough for 2500 hp.

The engine is a 496 bbc with 9.5-1 comp ratio. I have twin gt4788 turbo's for it with the .96 ar exhaust housings so it should spool quickly.

Thanks
You can calculate the hot side flow requirement. First exhaust should be 1.25 X exducer of the turbo. As far as A/R, with what you have posted....you need around ~54lbs/min of turbine flow.

 
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