u can make more than 250 on stock internals as long as u have a good tune. i am makeing 330 at the wheels on stock internals. i would push for more but i have maxed out my 550 cc injectors
f motors love boost low compression and strong block i am running 12 psi daily for over a year and not had a problem but its not psi that breaks stuff its hp and tq any thing above 330 really starts stressing the motor and trans. i would run more boost but i am at the limit of my injectors 550cc...
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