I had a Nissan Maxima that was great. A company named Stillen has lots of stuff to hop them up.
That’s the thing - (and someone else mentioned this) the Nissan community had a lot of vendors , more competition, and therefore better value aftermarket parts. Stillen used to be active on the various forums and really provide solid proof of their products working. For the VQ35, a plenum spacer was a very popular mod. He would spend time to prove that his product was the best by dynoing his own product against other spacers and posting results on a forum. He once challenged a competitor to show up at his dyno and prove his numbers. The spacers were only $250 and made of billet aluminum and he all the hardware you needed (including a copper heating gasket and pipes to prevent throttle body freezing in the winter.
Also, Nissan parts were easy to develop for. Shift knobs for instance were screwed on. You could get a Nismo one for $60. The quality of the parts were sublime too. Fujitsubo, Amuse, HKS, etc all made quality systems that actually sounded good.