What mods can I do with a warranty?

Quicksilvers

The Nissan dealership service department said the only performance modifications I am authorized to do is a cold air intake and they recommend to do the Nismo cold air intake, K&N panel drop in air filter, and a catback exhaust system and they recommended the Nismo catback exhaust. They also said leave the stock catalytic converters alone and don't replace them with high flow catalytic converters or use test pipes. That is ok because once my warranty is over I can modify my 370z as I wish. Engine failure is possible with any vehicle.