which problems may i run into? car is lowered and the wheel would be 7" wide...

 

depends on your tires too. check the offset calc here :

http://forums.maxima.org/showthread.php?t=244080

 

oops
how the hell did i miss the calculator up top?

does anyone know the offset of the factory 16s on 4th gen SEs?

 

maybe 45's.

 

IMO 50 is too much. you "might" be able to clear it since it's a 7 inch rim but a 5mm spacer would really help.

for reference on a 8 inch rim at 45 you're almost touching the strut towers..and i mean it's within 1-2 mm clerance. at 7 inch would give it more clearance..but since your offset is at 50 that might take the clearance away.