As I said, I spent around $1200 on those mods, which I consider a bargain. I'm probably at 180hp as a conservative estimate, which is a nice improvement over stock. I've actually been acquiring turbo parts for the last year, and I'm going to get dyno'd before and after. Except for the header, cam and cai, the NA mods I made will remain. My goal was 200hp, but I'm at the point where it's cheaper to go FI to get there. If you only want a moderate boost in power, I still say NA is the best bang for the buck.Originally Posted by scott_fx
Don't forget other hidden costs when you add 100hp with a turbo. A stock clutch won't hold, I would probably put in a stage III. And I would certainly upgrade my injectors, fuel pump, and seriously consider aftermarket pistons. Boost is a slippery slope, no one ever seems to be happy with the psi they say the want. A Miata kit might not need an upgraded ECU, but I would definitely swap mine. And I'll need to monitor everything as well. It quickly adds up beyond the base $3k. If someone only wants to add an extra 50hp to a daily driver, NA is the best and most reliable route.
If you strip your car of 75lbs before going to the track, you can see the difference on your timeslip. It may not be much, but it's just a hobby after all. Adding a dual exhaust is something I would call rice because it's purely for show and to give the impression of power. It's on the same level as installing a fake turbo sound device in your muffler.