Our N16 shares the same chassis as the USDM B15 Sentra. Right down to the QG18DE engine. The SE-R Spec V uses the QR25DE 2.5 litre engine. The Americans like things big! This means quite a lot of hop up parts avail to the American market. I found Nismo front and rear anti-roll bars, Nismo strut bars, Nismo & HKS exhaust, Brembo & Wilwood brakes, etc. etc. Here's a good place for those Nismo freaks
And Here's a decent forum
Mike Kojima's excellent series of articles on tuning the Sentra
More links coming up.