How much or would i gain swapping my 03 341 turbo to the bigger 351 turbo.
I'm one of those guys hit 517 the other day stock turbo and sticks with what's in sigWell of you plan on 60s that good also. I've seen guys on here that hit 500 on stock sticks and turbo if not mistaken. Twins will definitively be better all around than a single but for your needs I'd think your okay. I had chris at engineered diesel build me a 63/68 and I feel as if its not that much different than stock spool. I'd call him and tell him your goal he can build something for your needs and pocket.
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Wow did you have the 351? If that's the case I'm at Almost 600hp I'd guess? And for sure more after my mild pump from Todd.I would get the 351 to save some coin, then upgrade to the ATS Aurora 5K plus twins. Also, with 60s and a Smarty you will hit 550 easy. I have II 60s and I put 588 down.