So these are my questions the guy who built the car, I believe built it just for a track car, I dont go to the track I just enjoy driving it as a fun car. Alright he has these suspension mods done to it. Sub-Frame connectors. Adjustable upper control arms, and SouthSide lowers. 50/50 rear shocks, and 90/10 front.
When I turn the car it tends to be really hard to turn, I love the way the car hooks up when you push down the throttle, but I want it to be able to handle better around the turns, not like a f1 car or anything just a little better turning. How can I do this and still have excellent straight line traction?
More straight line traction then turning!

 

I would say first thing you need to do is remove those 90/10 front struts he put on there and go back with some 50/50 ones instead.
also is the rear end making noises when you turn and scuffing the tires??? he might have put a spool or a locked rear end in the differential which ain't no good for street driving. is you can, I would ask the guy who built the car. if not, you may have to remove the cover on the rear end and inspect the differential to see what's back there and if there is a spool back there, replace it with a posi differential which will still give you decent traction but make turning lots easier like it should be. I would do this soon as a spool on the street will just wear out your rear tires really quickly as the outside tire can't keep up with the turns and it just scrubs the rubber right off the tread every turn you make with it.

 

Yeah it does have a locking rear end. I know that for sure. What should I replace the 90/10's with? Like name brand and model if you know?

 

you might want to check out Steeda or Kenny Brown for their advice on handling suspension components like front struts and such. I can't give you any model or part numbers right off the top of my head but there are lots of other guys out here who can give you some advice on this I'm sure. It might help to make a post in the suspension and handling section too instead of just here.
and a locking rear ain't necessarily bad provided it releases in the turns but you do not want one that stays locked up all the time for the reasons I already listed above unless you like spending money for tires. LOL