With every modification you take a step away from the civilized Ford engineering and throw caution to the wind. It will idle rough, probably be cold-blooded, be loud, vibrate more, get worse mileage, require premium fuel, etc... its a bit of a "can of worms" effect when you modify a car a lot.
Plus drag racing isn't exactly friendly on the drivetrain.
Personally I think that's a lot of hassle to run a high 14. Just not enough bang for the buck.
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2005 Focus ST 2.3L
A loud, red, good time