I don’t think there’s anything wrong with running 1” bars. But it depends on the whole build. Ride height plays a big part of that. The tires being used are a big part of that. For a car relatively close to the stock ride height and using 15” rims and the street legal tires that are available for those, 1” torsion bars with aftermarket sway bars will work well and you’ll have a car that handles far better than they ever did stock. I think the 1.03” PST bars are a great choice for a street car with some mild updates to tires, braking, etc.