well here in Cape Town, sportlines are more expencive than pro's and the suppliers here say that the pro's are more of an everyday use spring, and the sportlines are more of a track use spring. Also here they say the pro's give you a 25 to 30mm drop and the sportlines give you a 3o to 40mm drop. They also say that the sportliners are a much harder spring than the pro's?? Are they spinning some bull story to me then? The modding industry here is sooo corrupt