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also its lickely 172s/182s will be used on track being high performance so it saves the weight.. lower centre of gravity.. imagine rolling and then being showered in glass. Strength and stiffness would also be affected with a giant hole in the roof.
road cars converted to race cars will quite often have plates welded into the hole if you aint noticed..
I remember speaking to a Renault dealer when I was buying my 172 and asking him why they dont have sunroofs!!
He said that they initially had planned to put sunroofs in but due to the car flexing from the engine power it caused them to crack and they scrapped the idea.
How true this is I dont know but sounds kinda logical