I have MAC long tubes and Ford C springs which lowered my car about 1 1/2" in the front. If I hit a 4" dip in the road going about 40 mph I will get a scrape every now and then. They don't show any signs of damage though. It's just the flanges that have touch so far. I'm waiting for the flange to be ground away and get into the tubes so I can order some Bassani stepped headers 
You have to watch out for those covers they have on the underground tanks at the gas stations. Some of those stick up pretty high and I thought I ripped my header off one day when I hit one shortly after I got them installed. I give MAC credit for making a tough header. It's just too bad they look like sh!t a week or two after you install them.
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels.
"The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance."
Griggs Racing
ICQ# 42269241
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