I have a 1996 +8 4.6 which was modified by RPI after buying many satisfactory upgrade parts for my old range rovers , it dynoed at 280 hp and has since been further modded to approx 300hp but not dynoed . It has made several trips on the continent before moving to Canada where it toured extensivly it now lives at my home in arizona and regularly puts in 500 mile days where every Hp is used .
Now with about 30,000miles on the engine it has developed a small oil leak from the rear of the oil pan , something the engines were known for, other than that it hasnt missed a beat , runs strong , quiet and smooth .
Good job RPI