However this also reduces your mpg a little bit. I think it's true but you get lower mpg only in local(the engine also feels stronger). In highway mpg is fine. For my G35S and M35X it's different story, we get lower mpg in both local and highway. Why? Because we only have 5-speed auto without overdrive. In highway our engine runs like 3k rpm in 120 km/h but I like it because I feel like superman in local and highway all the time. (If you put in sport mode or downshift to lower gear, you also get same feeling in 7 speed auto)
Of course if I floor my GSF, GSF is faster because V8 is V8. Not sure how Nissan V8 feel. I never own one but it should be very good(like V10???)
You can modify your intake, exhaust and car computer to increase your power in high rpm for your Nissan but you will also lose some power in low rpm.
Do you know Nissan provide special oil called ester oil for VQHR? But it's expensive and not fully synthetic. Royal Purple HPS uses similar technology like ester and is full synthetic. I think Redline is also good(even better than Royal Purple) but I never try it because it's much more expensive. In USA 5QT Royal Purple costs only $6 USD more than Mobile 1($25USD) if I buy 5 gallon(20 QT) at a time. (I have both G35S and M35X and change their oils every 5K km by myself. So I need 5 gallon a year.)
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