In Texas you don't have to have a windshield but you do have to have wipers for your safety inspection. You gotta remember we have a lot of uninsured, undocumented people running around with cars that are a hazard on the roads. When I used to have my SC I had 2 1/2" cats into a dual in single out resonator then 3" to the rear muffler and I never had a problem passing smog even without a tune and using a C&L MAF to compensate for 42# injectors. I had changed up everything except the short block and never failed emissions. If I had it now I wouldn't even have to have it smogged, but parts were getting scarce and I needed a 4 door so away it went. I don't mind smogging the car and If I get the Rear O2 turned off I shouldn't have any issues, since it's only once a year, I'll just switch out the Cat when needed I guess if there isn't an alternative with a high flow cat that will pass.
Jeff