What are your thoughts on performance parts labelled as "Parts for competition use only or not road legal" Are they dangerous, just not approved for road use or does it indicate a manufacturer with no confidence in their product? On the other hand if it's for competition use only you assume it will be stronger but then a lot of competition cars are stripped and rebuilt each season or race to maintain the tolerances. I recall a fast road cam that was so worn it lost loads of valve lift to the point where performance was seriously impaired. It turned out the metal used was softer and was intended for a season use only. I guess softer metal must have some benefits but I struggle to see why you'd want a softer cam lobe!