I keep pondering this and I'm convinced it has to be done. it's just too 'tall' now. I'm thinking 4" is a safe amount, but I think I could go farther.. sitting ontop the frame the seats need to be 12" raised for me to have the correct view thru the windshield, also, the rear window is a bit too far up and anything sitting behind it will look akward.. 4" will bring things down into proportion a little better, but if I could do 6" that would be better.. I'm just not sure how far I can go