If you're cobra's way slower than an LS1 with those mods then you'd better get it checked out! You should be well into the mid to low 13's with those mods so it really should come down to the driver.
BTW not all LS1's run low 13's stock, some are a fair bit slower and some have suspect drivers as well. There's also the odd factory freak that hits 12's with slicks although the fastest "stock" one I've seen was running 13.32 on radials.
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GT-40 heads (ported, polished, + milled), B303 cam, 1.7rr's, JE pistons, Offy intake, Carter AFB 625cfm carb, Flowtech 1 5/8" shortys, Flowtech X-pipe, MAC Flowpath exhaust, MAC pulleys, 373's, subframes, Eibachs+Tokicos, B+M ripper, FMS Clutch, Zoom Quadrant+cable, 17" CSA Ultra rims, 235/45ZR17 Yokohama AVS S4's, MSD 6A ignition+coil, FMS 9mm wires, Carbed, Naturally Aspirated, and Nasty!
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