Increase HP for '07 2.4L Solstice??

I have an '07 2.4L Solstice. What are the quickest and most affordable ways to increase HP? Plus, what are the not so quick and not so affordable ways, (short of changing out engine), to increase HP??

Welcome to AF.

This thread has been closed because you have already started an identical thread in the more appropriate Solstice forum .

Please note, starting multiple threads on the same subject is not permitted as per forum User Guidelines. :)