OK. well mine was probably lasting for many many years and suddenmy started to show a great increase in pressure. I was a bit afraid it was actually true as it did move up and down instead of stopping to work... We just put a new sensor in and it was perfect. For one week, the same problem again! Long story short, we put in a new one for the second time and that have been working perfectly for over a year! So it must have been a bad part I got the first time... The will not change regardless of what exhaust is on the car. I have the same idle rpms. regardless of what exhaust I have on it.