is there any way i can tell what has been done to my engine it boosts to 10psi on the gauge so im not sure if its just been chipped.How can i check if anything else has been done?also what oil should i use being as i dont know what has been done to the engine..Can the boost be turned up a little by shortening the actuator rod or is 10 psi about as high as it can go safely many thanks in advance