Im not saying you cant run into the 10s with a 2.5 inch system, but why bother? Plus maybe that was a 2000 lb car. Or one with cutouts.
You will 100% give up power over a 3" system. I don't think anyone would argue that. Now with that said, if a 3" system is a nightmare to install maybe you consider cutouts. Or go to 2.5 at the back of the system, which would affect power much less I think.
Also FWIW I believe its been proven that the place you lose the most power is right behind the collector when you go from a 3.5 to a 3. Would be even worse with a 2.5. They make gradual reducers which help. Something I wish I had known when I had my system built.
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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