The 450 is not necessary. I'm going to be doing my initial tune on 93 first and then move onto E85 (I'll be going flex fuel fyi) in maybe a month or so. From what Charles told me, the upgraded S1 + Walbro 450 will be a HUGE upgrade from where I 'would' be at right now. I'm pretty much going overboard, since I'm not even going to be running on the SI unit.
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