I'm a newbie but,
the higher offset the deeper in the wheel well it will sit.
stock TSX offset is 55, which is apparently relatively high.
lower offset will begin pushing the wheel out from the fender.
combination of tire/wheel size and offset could mean problems when offset is (roughly) lower than 45 or so and just looks-wise it might push end of wheel/tire out beyond fender, even if it doesn't rub.