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They are equally as reliable.
They both with a tune eliminate the dip. And add power all around.
Some UEL have slightly better low end less top end.
Some EL have slightly better top end and less low end.
UEL enhance the boxer rumble
EL minimize the boxer rumble
And then you have the ace header. The performance benefits of the best UEL+EL combined.
Personal recommendation. Just go turbo. Or you’ll never be satisfied.
2nd recommendation ace header + tune. And work to supercharging later.
If available flex fuel +E85 regardless of what you choose.
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