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LT, ORY into stock catback HP question

Generation III External Engine - LS1TECH - ls1tech.com
This summer I am going to be installing my 1.75 headers into a ORY. However due to my wifes daily driver needing some repairs the stock catback is going to stay. The original owner replaced the stock muffler with a magnaflow but the piping size is still the stock size (2.5).

How much HP is that likely to cost me vs having a 3" magnaflow catback on the back? Is it something I would even feel? My mods would be the headers, ory, ls6 intake, Ported tb, tb coolant bypass, air/egr deleted, frost tune ');


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