Roll bar questions

[MS6453@aol.com]

Hi all, 
Well it's the time of year when some one has to ask about the pro's & con's 
of roll bars. I need to know if,
1) Do they restrict seat movement
2) Is there added wind noise
3) Am I going to have lumps on my head after a bumpy road   
4) How much has to be altered to install
5) Is there more than one design
This is only for  cosmetic reasons, I really like the way it looks. Any added 
safety I get from it will be a plus. 
Thanks,
Mitch 74 1/2 TR6