I've had a little experience installing both. Some long tubes can be slid up (very carefully) from under the car. Most will require unbolting some parts though. Long tubes are great if you've got the engine to support them. I wouldn't put them on a stock 5.0. Maybe a mildly modified one. Anything more than that and you'll see a benefit from them. Shorty headers are easy to change plugs on if you have the unequals like I do. Unequal length shorties make a tad more power but plug changes suck @ss.
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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s
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