You can't get 4" just from springs. You'll hit the a-arms at 3.5, the tie rods at 4.5". If I get some time I'll dump the air out of the bags and show you what 4 looks like (I'm currently at +1 because of the roads around here).
You're much better off fixing the airflow issues underneath than blocking the air. No clearance issues, and it'll be quieter. Take the extra few hours and do a pan.
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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