The 2.5s are the 2.25s just opened up at the opening. It does make the sealing lip a lot thinner I had some sealing issues ion the D port ones on my 81.
It will still have GOBS of TQ and HP even with the intake and exhaust.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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