I would personally rather get a C4 for your car because they're lighter, smaller, and as mentioned less parasitic drag. A C6 would be overkill, you're not making enough power to kill a C4 in decent condition. You will definately feel a power loss through a C6 compared to a C4, but if you really want a C6 in your car it is a good trans and will last with abuse (so would a C4, though).
It's all up to what you want to do. Good luck,
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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