Never one to let things alone I purchased a Cox Hyperviper with the express purpose of modifying it into hopefully a decent performing airplane. The reports seem to range from anemic to adequate regarding the factory engine. Here are my choices for modifications: Add a Black Widow Cylinder and a high compression head to a Killer Bee backplate (all I have is the backplate) or install a TD .051 or a Norvel .061 BigMig using a Texas Timer backplate. I'm leaning towards the Black Widow just because it is probably an easier install. I was wondering what opinions/advice might be regarding this.

Thanks,

Rob