Considering temp and the fact that you're running stock exhaust that's really not bad at all. There's very few sentra/200sx's built up around where I live, mostly Honda Sewing Machines, so when I see one that has been modded I try to ask them what they've done, one guy last night thought I was trying to race him (was curious what exhaust he was using, hadn't seen a dual tip exhaust on a sentra in person and his was DAMN quiet) and was almost able to keep up (ok, he more or less left me sitting still, rofl), turned out he was running a 1.6 xe with a turbo, this was evening so the temp was probably upper 70's. Get that exhaust and cat changed, you'll probably gain another 15-20 hp
