I spent 63 on a TOP OF THE LINE 1 wire oxy sensor for my 92, it cycles better and I went up about 2 mpg over the bosch universal sensor! 40 dollar difference but worth it if it'll last longer and better performance and economy, the cheaper 4 wires are just fine but a cheap universal 1 wire, do not waste your time and money on em. yeah they work, but that's all they do, get ones that look like the OEM type and you should be good for a long time, spend 20 on a universal and replace it every few years or buy an OEM type and replace it every 10 years or so.
that's just my input though, I go with OEM even though I aint got much money cuz it works really good.
and a cold air intake only really helps if you have done a good port and polish and a nice flowing header and exhaust, other than that it's gonna sound awesome but not much more go, but those spectre filters are awesome I've heard! I like my K&N square filter with my cut air box, nice deep growl breathes good.
ok I'm done rambling sorry guys I get bored sometimes. keep em going!