Tire sizes for BMW 330i

[Young-Kyu Yoo <yoo@best.com>]

The stock rims on my 330i are staggered.  They're 225/45 (7.5" wide) in
front and 245/40 (8.5" wide) in back.  Is there any way I can have the same
sized tires all around and remain in G Stock?  If not, what would be the
best way to offset the disadvantage (if there is indeed a disadvantage) of
having larger tires in back?

Thanks,
Young
01 BMW 330i GS