well, not to dig up an old thread... especially one thats been jacked LOL. i was just beginning to experience the way the V's handle and take high speeds. honestly im very let down. IMO this car absolutely falls on its face at any speed above 100 mph. it feels like im dragging a damn 4 ton weight. watching those you tube videos, confirms how i thought the car would be in 5th. since my tranny is basically done, and 5th syncro is gone... i wouldnt know. lets just say, on a pull from 2nd to the redline in 4th... an 07 330i walked me. last time i checked, those werent fast.
AND i have to say, at those speeds (about 130) the CTS doesnt feel too unstable at all, but then again im lowered pretty signifigantly. the car was manuvering beautifully and very stable. and i dont think it would take all that much power to run faster than 160... first off, like said a few pages back... a good valvetrain upgrade and some ARP rod bolts, spinning 7100 rpm even a slightly modded V would prob reach 170+.
i have a BRICK aero-designed 06 silverado ss, on 24s with pretty tall tires... slammed to the floor, bedcover (those two things help SIGNIFIGANTLY at high speeds on it). it makes a little shy of 600 whp without spray, and it used to have a LS7 Z06 T-56 in it. remember, we are talking ex. cab reg bed fullsize truck here... its seen 165 and was litterally still pulling absolutely no problem. i think the gearing had alot to do with it, cause now that the 4L70e is back in it, it falls on its face once it hits 4th. when my TVS-charged 408 goes into the truck, the T-56 will go back in as well... hoping to take it somewhere i can actually run it, and math is telling me that with the projected power i should be making, and the gearing... im looking at 200 mph, possibly ++. (750 rwhp + 100 wet shot, redline 7200 rpm)