it's not a given that you'll get better mileage with the 4cyl over the v6. 4 works harder, revs higher.
My very 1st swap was 4cyl to V6.
Same car had noticeably improved economy(est ~15%) with far better driveability (due to torque increase)
Broke the diff immediately & upgraded to bigger, taller ratio (2.92:1 iirc). Same tire diameter
Driveability improved again with fuel economy at least 30% over the 4cyl.... and that's not even trying to granny drive it
Also, better make sure your oem V6 gearing, suits the torque curve whatever 4cyl you choose
Add boost to a 4cyl ?? No comparison. There goes the fuel economy 'theory'. Optimum gear ratio changes once again.
I like your 'anything can fit' spirit
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