Spirit R engine only has about 50 miles on it and still runs like new. Turbo conversion is the same. I learned through making mock up cars of where i want my FC to go that the stock 13B has more torque so i don't need these items anymore. I will let them go for $7,500 or if you just want the engine $6,000 and the single turbo conversion for $1,500. I hope to get them off my hands soon!