Have a new inch and 3/4 muffler twin cente exit , made by Manta. In anyones experience will this give more power better note, than my 2 in pipe with 2 1/2 in v8 muffler.

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Ruling the bends and bending the rules since 1959

chong made 10hp more with 1 3/4" exhaust than with one size up or down....

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did I tell you that I won a trophy?

No, he finished up using a 2" system. So did my 1360. My 1412 made best power with 1-7/8".
But 1-3/4" is a good starting point.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

really?? even you jumped up and down when you went back to an 1 3/4" - what was the change?

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did I tell you that I won a trophy?

HaHa (1360) was 1-3/4" with Maniflow med bore LCB, and RC40- I then went to a 2" system after Chong did. 86.6HP ATW at MRC last year.
Barney (1293) was 1-3/4" with Perry 3-1 and Lukey, before dyno day I put the RC40 on and binned the Lukey. That shut it up and gave more power too. 59.4HP ATW at MRC this year.
Note the PO had mounted the Lukey back to front for more noise (but this restricted flow).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.