the only advantage to manually shifting an automatic tranny would be if you are crusing and want to punch it you can down shift 4th to 2nd tho get the revs quicker even though when you floor it the computer will put it there anyway, but i find it helps sometimes. i've heard its really bad for your car so don't do it much.
98' z28 SOLD
2005 GTO cquence breaks, pacesetter LTs catless mids, custom catback volant intake SOLD
2004 GTO VORTECH blower willwood 6 up front 4 in back, drop kit, demani 18"s 06 tail-lights bessani catback
coming soon(yearish) kooks 1 7/8s custom grind cam, arh heads, 370ci forged, pulley, possable e85, mini tub,cage,seats,harness', built rearend, stubs, halfshafts, driveshaft, full suspension.