I am waiting for ahad_civic to come around here and highlight your attention towards his signature which reads: 'reliable.. fast.. cheap.. pick any two'
So its true, there is a trade off involved.. either you swap the H22 in properly, and enjoy the drive - which will keep you from having it as your daily drive, since you should be using Hi Octane fuel on it..
Or if you want CNG, just go for a nice cheap swap of the D15b vtec.. its a powerful engine mind you..