I dyno'd with the Y-Only on a STOCK car and it lost ~10hp (with K&N's).

BUT, I used just the 'Y', not the tubes attached to it...I think the stock tubes choke it down quite a bit.

I also think the shape of the stock 'Y' help force the air into the blower better - but it shouldn't matter because it is not boosted yet at that point.

If I end up with another intake, it will likely be the Y-Pipe WITH tubes, like Steve's....because it looks stock and no worries about water intrusion.

SQ