well it all comes down to money but initially it depends on how much he wants to spend on the truck alone, i bought mine for 10,000, a new one just like it would have been 35000, if i spent the extra 25000 on mine id have a hell of a truck but itd still be a 99. honestly it looks like the 6.0 is making more progress in the top HP wars then the 7.3 is currently but i believe the fastest 7.3 and fastest 6.0 run very close in times? low 11s?
id say it all depends on how much power he wants and how much he is wanting to spend to get there. if he wants a good reliable motor that he can coax some more power out of, then id get a 7.3. If he really wants to go nuts and build a lot of power get a 6.0. in know on a six liter you can get somethin like over 400hp with an sct, exhaust and intake
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