I would say do both front if you are going with the SRT springs. I don't know how much of a difference you would feel with just one but personally I would be way more comfortable with a matching set. You could also end up with different ride height on one side etc. with just doing one but I'm no expert. There are a good number of eastern Canada members and a few that have done drops on their rides. You may want to try the marketplace section as there are a lot of people with dusty NA springs not being used.