You asked a question, prelude, and everyone goes on about themselves!
Yep.
This link contains doctors' studies and has a chart that includes flaccid to erect amongst it's measurements.
Blackwell Synergy - Cookie Absent
On that chart notice that the 200 Turkish men had a combined averaged flaccid of 2.7" and upon erection 5.0". The largest flaccid on the chart is homosexual men at 4.1" and their overall erect size at 6.5".
Here, from the lines in which there is a flaccid to erect comparison I'll put it all in order from shortest flaccid to longest flaccid:
Flaccid-----------------------------------Erect
2.7"--------------------------------------5.0"
3.4"--------------------------------------5.7"
3.5"--------------------------------------5.1"
3.6"--------------------------------------5.6"
3.8"--------------------------------------6.1"
3.9"--------------------------------------6.1"
4.1"--------------------------------------6.5"
LPSG can't really be used to judge what the standard ranges of grower to shower are. Here is some data from a site many months back. I don't know if more has been added since then. Also, at another site (not the chart below) Thundersplace - overall the 3" flaccids averaged out to 5.75" erect (grew 2.75") and the 5" flaccids averaged out to 7.25" erect (grew 2.25").
http://www.erectionphotos.com/softH...dGalleryP01.htm
Flaccid Length--------Averaged Erect Length----------------Amount of increase in inches
1.00-1.49---------------------4.71-------------------------------------+3.50
1.5-1.99----------------------4.89-------------------------------------+3.14
2.00-2.49---------------------4.88-------------------------------------+2.63
2.50-2.99---------------------4.92-------------------------------------+2.17
3.00-3.49---------------------6.07-------------------------------------+2.82
3.50-3.99---------------------6.08-------------------------------------+2.33
4.00-4.49---------------------6.69-------------------------------------+2.44
4.50-4.99---------------------7.00-------------------------------------+2.25
5.00-5.49---------------------7.35-------------------------------------+2.10
5.50-5.99---------------------7.80-------------------------------------+2.05
6.00-6.49---------------------na----------------------------------------na
6.50-6.99---------------------9.00-------------------------------------+2.25
All in all, presented in this post are 7 doctor studies, Thundersplace database, and the photo site.
So, in general, upon erection, do growers become as big as showers? No.
Upon erection do growers tend to close the gap some. Yes, but not all that much.
I'm done posting about this topic, though I will be willing to respond to anyone in this thread.
Of course, in future threads when this topic comes up the usual 'no difference upon erection' or 'almost no difference' posts will abound. No one having read this data will link to this thread, of course, and ignorance or denial or PCness will continue in all it's glory (this probably means black guys are bigger upon erection and the pc brigade must therefore continue to believe growers catch up with showers in order to deny that). "Growers and showers are the same size when erect", or the dance around the issue with "There are growers who become bigger than showers" (of course there are, that doesn't mean a correlation can't exist) will continue unimpeded as always.