275-280 is not even a goal. I had 290+rwhp 291tq by 5300rpm with my maf maxing out big time not wanting to read anymore cfm's on a BONE stock sr. It was a s15 sr so it has the bigger turbo and injector advatage, but for a s13 sr, flying by the 300 mark its just a slightly bigger turbo and injectors a 300zxtt maf, and a fuel pump and safc. You can have upto 240-260rwhp with the stock s13 set up, but you need a bigger turbo after that, then the injectors maf and starts to crap out after 270-280. If you want 300+rwhp for cheap, then get a pulsar t28, s15injectors, z32 maf and safc. you're good to go for around $1000. (not including a different clutch). you can add $150ish and get a s15 turbo and put down 330ish, or you can put down $800 more and have 400hp+ with bigger injectors and gt3071r, but personally I would go with a standalone rather then a safc after 350hp. Too many options. It will be fast as crap at 250rwhp, but if you have 1500$ and want more power, then go into the 350ish range. It depends what you want, but all in all, 240's can be retarded fast for cheap, so it's up to you if you want something that has nore: responce, drag rights, or somewhere in the middle.