Three letters....IRS  That kills the 60ft times.  If they want to get any faster they need to swap out to a solid axle.

[QUOTE=Steve40th]I have seen some big numbers out of the Cobras, 2003 models. But, they can never seem to get very good 1/4 mile times. One I saw hsa 600rwhp, and he got a whole 12.2-112mph. One had a 455rwhp and ran a 12.1 118mph, then the other has 507 and ran a cool 12.6- 113mph. The speed usually is a good sign of HP. My 4o0 rwhp runs 11.9 at 118.5 all day. So are these dyno

i have 99cobra 298 rwhp.mods. are 62mm.t.b.kn.air fiter,mac long tube headerso/r/h-pipemac back system.4.10 gears runs 11.72@117mph. on street ets. no chip yet or air mass meter.beter recheck your dyno.shop.]

i have 99cobra 298 rwhp.mods. are 62mm.t.b.kn.air fiter,mac long tube headerso/r/h-pipemac back system.4.10 gears runs 11.72@117mph. on street ets. no chip yet or air mass meter.beter recheck your dyno.shop.]

That's a freaking AWESOME ET for a 289RWHP car!!!!!!!

[QUOTE=Steve40th]I thinl allot is driver error, but the speeds dont really match a 550-600rwhp car, that should be over 125mph easy.[/QUOTE]

word...in car and driver they ran a 12.9 at 112 stock i think so he has some traction issues off the line, and the irs is to blame for that i believe also.