Very concerned about my Z's engine, sounds rough on tick over and terrible sound when you turn the engine off. Its a 54 with 67k miles, no apparent loss of performance, starts everytime, might be a little high on fuel consumption (but what z isnt?). Had its big service at nissan Nov 2013 but they didnt do the spark plugs (they forgot to order them!!!) and they said the exhaust was a little corroded. Went through MOT last month.
The first 15 seconds is recorded inside the car the rest im holding the phone out of the window. Its the noise right as the engine is turned off at the end of the recording that worries me:
http://hdthreesixty.com/350z/engineshutdown.mp3
Will take it to the garage ASAP, but the guys on here seem to know more than they do so thought i would try here first. Any suggestion would be greatly appreciated. Thanks