http://kikerperformance.com/index.htm
I apologize ahead for posting this here but seemed a good place. I put these on a truck about four years ago. Honestly I don't check mileage but they made my old S10 run great. I have a 93 S10 that has over 279K on it. It is a 2.8 V6 with a 5 speed. Original engine and tranny.