Trying to decide between engine guard or crash bar type vs oggy knobs style protection for my CB400. The nicer engine guard or sometimes called sub-frames bolt onto the frame but some seem to partly bolt on to the engine. The really nice ones are over $250 on Japan Webike. Oggies around $150. What are your opinions on the pros and cons of each type? I am going to get it fitted when I send it off for service so ease of installation is not an issue.