Max HP on the viper GTS

What is the maximum HP you can get on the viper GTS (the cheapest of the 3)? I got mine up to 1110 HP but it handles like complete crap, even with the $47,000 racing tires. What do I have to do to improve handling? I also have a NSX type R with all the performance mods..but it only gets 511 HP...is it possible to get more? And..one last thing...what does limited slip do?
 
to get the viper to turn better try lowering your car as much as possible and strengthening the shocks.  then put all the downforce you can on your front tires.  i really don't know what i'm talking about but these are things just to try?
 
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