this is how i downshift into corners.
let's say car will be in third...
as i approach the turn i:
1. start braking
2. sink clutch
3. downshift to 2nd as i start the turn
4. coast/accelerate through the turn in 2nd

*coast means no gas [gran turismo 3, lol]

for smooth driving don't take the rpm's above 4k when downshifting, it might be a little jerky... [4k is little high though]

but if you in a high speed chase... you want to be in the powerband when you downshift. [5750-redline]

WHEN YOUR GOOD YOU CAN DOUBLE CLUTCH/HEEL-TOE THRU THE CORNERS.