ONLY thing I would change is that dinky little air filter to the original 'cold air' system with a carb top adapter for the snorkel and a K&N E-2340 filter for the original housing! Cold air intake rules!!
I totally agree on the CAI (first performance mod I did on my Pontiac Solstice too). It is next on my "upgrade" list for the Opel GT - hopefully sometime in 2008. Thank you both for the comments and rating!