I'm sure July Mustang sales were down... due to lack of inventory. And that is typical this time of year since the manufacturers and dealers are ramping up for '06 models. I don't forsee much cooling off of the GT any time soon. All the local Ford dealers seem to have 4 or 5 V6s and one or no GTs right now.
I drove past Ford West on the 91 fwy the other day and their lot was very sparse. They used to have about 7 or 8 rows, 3 cars deep of V6 Mustangs and a few GTs. I only saw three cars left the other day.