Long tube alone?

[angman2112]

Hello, I have a 2008 GT with a Procharger, I want to put long tubes on it, maybe hi-Flo cats, can I leave my stock mufflers on it and still realize max HP gains?

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[Swtbabybilly]

Can't see stock mufflers holding u back anything noticeable tops 1 or 2hp which i guess isn't technically max gains but again dont think its anything u would ever notice