It all depends on you I'd say. Are you planning on tracking or 1/4 miles? If the latter then maybe the 650 would be a better bet but for the track 600 will be just as good as the 650. Also, are you going to run meth? Maybe use that difference in $$ for that if you haven't thought about it before. Horses are horses but you will want to check out real world comparisons and the difference in 60-130 times etc.. If it's all show and $$ isn't an issue then heck go with the 650 for personal satisfaction.
You will also be wanting to add an x-pipe to your setup. HFC or catless is fine and your tune will have to be updated. Like TECH said, installation should be the same.
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