I'm also definitely quicker running a boosted 10.5 than I was with 5.5's and 6.5s both in 2wd and 4wd. Mines boosted so hard that on the straights you can't tell it isn't a 6.5 unless its a long straight, but its a lot smoother on the infield.
Running a faster wind with the EPA reduced isn't quite the same as a less powerful wind, though you can do a lot with software settings. A less powerful motor is undoubtedly the better option if you have the chance, but if money is tight I can see why you'd want to try EPA first. In a 2wd I think you'll find the power band all wrong, though you can adjust that on the TX as well.
Put it this way - if it was all down to EPA why don't we all run 2.5T's and adjust the EPA so its driveable......
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Yz4 - Yz2
DEX210 - Cobra 4210- DEX410
RC10 Team - Manta Ray - RC10T
Mini Trophy - Blizzard - Wheely King
Tz4 - GT24B
BMRCC
Emergency back-up race controller
(but only if nobody better is available)
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