Yeah, from personal experience, the longtubes give more torque and hp than most short tube configurations. Perhaps if you lose some low end by installing the longtubes, you'll need to tune the A/F to get it back. Personally, I gained 2.5 mph with longtubes. I know fellow stangers who have gained even more.
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'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.
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