Clutch springs are engine-specific components. TRW continues to strive for improvement and innovation, and they provide two different models on the market.
Clutch springs starting with article number MEF1**-* are a tangible and noticeable upgrade. They are reinforced, and perform about 10% better than the original ones when it comes to contact pressure. You can also count on better all-round performance and less clutch slip.
Clutch springs starting with article number MEF3**-* approximate the original characteristics of most engine manufacturers. You can therefore assume that the point of contact is more or less identical to what you were used to. Quality, dimensions, specific functionality, you will hardly notice the difference from the original clutch springs.