Any Solstice needs to breathe better.  The answer currently is a K&N air filter.  K&N filters are a little more costly, but these filters can be cleaned and reused.  K&N data suggest both milage and performance gains are worth the price. 

The cold air induction was added to this 2006 Solstice at the time of purchase so is considered factory-installed.  This Solstice is owned by Frank and ByVonda Thomas, Anderson, IN.