Its your engine...not mine. Do with what you like. I am one of those people with over 100K with nitrous, im just saying...be careful, a car with 120K with nitrous is like making a 60 year old man run a mile in 5 mins. It can be done, and safetly, just as long as the old man (or your engine) is in top notch health condition. There is not that many 60 year old men that i know of that can do that though, nor is there many engines that have been completely and properly taken care of their entire lives. Its just a word of warning... IT DOES WEAR YOUR ENGINE PREMATURALLY no matter what anyone says. You should still be able to get 180K out of a KA24DE if you start spraying at 100K IF nothing ever goes lean.NISSANFREAK said:100,000 miles! NO Nitrous! Thats a load of crap. There are people on this board with over 100k pushing nitrous with no problems. It all depends on how you treat the engine. With regular oil changes and proper maintenance your engine can last for awhile. I got 123,000 and it runs like the day out of the factory. I use valvoline max life oil and it runs great.