with an auto you will have to upgrade after about 500hp. th400 ,powerglide or upgrade your stock auto( rebuild it) so it can handle more power. SP has some good options for upgreading your auto tranny.with a some work ( depending what you end up doing to the auto tranny ) you can make it fast off the line. and fast over all. But auto is weaker then 6speed and 6speed can hold more power.And I can see auto breaking before 6 speed will , this is only when you comapre both trans. I am not saying that auto is BAD ( is beats the living hell of any other stock auto trannys) but you are you are 2 gears short and less power output. the only thing you need to do on a 6speed to hold some sirious power is a GOOD clutch and some good lube ( change often). Less worry more fun.
This is commin from a person that owns auto.
P.S Dont get me wrong most of the fastes supras out there are auto.
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