When I was looking at NAGTROC doing some browsing on how to get 500 whp out of a GTR (don't own one, just curious). Guys were talking about as long as you do upgrades past any of the sensors, ie: O2 sensors, that what can they (the dealership) really say as far as warranty goes, you haven't modified anything to affect how the stock engine and ecu operate. Sure the ecu is gonna adjust to the increased air flow in the exhaust but it is still using the stock parameters that Nissan programmed. Another thing to do is talk to the service manager at your dealership, ask if they have a problem with your dad puting a mid-pipe and exhaust on the car or the brakes that were brought up earlier. I have read where the midpipe makes a world of difference in the car so just another mod option. Just my two pennies.
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