280z/300zx

CBE like Fast Intentions = ~7whp. (Over a regular 370z it's more like 15whp but since the Nismo comes with a nismo exhaust already the CBE is only slightly better for about 7whp)

Stillen Intake = ~7whp. (Yes over a stock car it will yeild 15whp but it's been shown that on a car that already has exhaust mods it only gives about 5-7whp)

HFC = ~5whp

Headers = ~12whp

Tune = ????? (The nismo already comes tunned, so how much more hp are you going to be able to squeeze out by getting an aftermarket tune? That becomes the questions. I wouldn't venture to say it's much. You might see some gains under the area of the curve but strtictly talking about peak hp, I'm not sure you'll see much. I know some here actually lost hp after getting a tune. Of course a lot has to be said about the tuners skills as well. I would say this mod is questionable for the NISMO in terms of gaining hp. Of course in regards to AF ratios and max performance it might be helpful.

Pulleys = ~5whp.

So thats your basic bolt on's. You are looking at about 36whp or close to 50 hp at the crank. Is it worth it? Thats up to you but honestly with the crappy traction this car has stock I wonder if there is much point to it witout also looking to upgrade the tires. Good luck

Remeber the sum of total performance gained is not equal to individual gains of parts totaled. As you start modding the hp gained typically decreases. Example: Stillen Gen 3's are good for about 15hp over stock. Stillen CBE is also good for about 15hp over stock. Combined you will only see about 20-23hp gained over stock, NOT 30hp.