Jeff,

Really appreciate the information - very helpful....

Q: The new Porterfield race compound - is that R4-S ? They said no such thing as LS....
They said "RD-4 is better for race vehicles that do not generate a lot of heat. R-4 is better for high heat race vehicles and the R4-S is for street use."

They quoted me $249 for RC114 ST-43's....

My first impression: Porterfield is extremely responsive to their customers.....