If you are looking to double the HP or make it into a super car, you are out of luck. there are some members that have added turbos and it gets expensive and in my opinion, not worth the money for what you get. You have a 3 cylinder .999L car. designed to sip gas and take up less room. enjoy it they are quite quick and fun to drive.
If you want to make it unique or add your personal touch, Smart Madness is a great place to start.
Although the range is low the speed and quickness is not low in the Electric Drive smart car. It makes driving in traffic a blast because you are not expected to be quick but you are getting you to the place you need to be in traffic. Almost instant torque and no gear lag makes it pull away from almost everyone. It's not a V8 but it a lot of fun.
I love driving my gas Bee but the gear shift lag gets in the way during some traffic maneuvers even with paddle shifting. Get the gas smart out on a curvy road and the paddle shifter makes it a blast so that even a V8 cannot pull away. I enjoy the challenge that the small engine gives you when you use the paddles even on a race track with much faster cars. I have to rely on my technique to improve my times and cannot just power through the track to improve times.
Give your smart some time to work into your driving habits and vice versa. Get it out on some curvy roads and shift away...you will smile at the end of your run. I found that a cold air intake and silicone tube makes you feel faster without increasing your HP. A Go Pedal from smart Madness will make your shifts quicker but big HP gains are not easily found.
Put your money in the suspension, wheels and rubber.
Wider front tires turn it from an understeering pig into "corners on rails". Drilled and slotted front rotors improves braking especially in the wet. Easy to build or buy an exhaust that will make it sound fast. SUNROOF!!!!!
I've had my Smart Brabus for less than a month. I recommend a "Go Pedal" for every Smart owner, but it's a must for anyone looking to maximize performance. Anyone can install it. The cost is $300 and you have 30 days to test it out. It doesn't increase hp, but it really improves performance off the line. As one Smart owner told me, your "Butt" Dyno will feel the difference. By the time you get the jump on an unsuspecting driver, it's too late for them to react. There are 3 modes, 1. Race 2. Sport 3. Economy and Normal. Each of the 3 modes have 3 additional modes to allow just the exact power curve that fits the performance you need for the right situation. It comes with a control head that allows the driver to make the necessary adjustments, but the driver must not be using the accelerator pedal while the adjustments are being made.
The next mod I'd add is a Sila Cold Air Intake from Smart Madness. The air intake is $169 and you must buy the $69 silicone tube that keeps out the hot engine compartment air out and directs the cool outside air in. Smart Madness sells the two together for $219. You can have it installed for $150. The dedicated Smart website below provides step by step instructions on how to remove parts you don't need and install the parts you do need.
I'm not a mechanic, but I installed it myself. Everyone told me I could do it. I'm not sure if anyone told me it was easy, but if they did, it wasn't, but I'm glad I did. It's a royal pain in the ass to do, but I learned how to work on my car. Now I'm not afraid to try doing any modification myself. I quickly learned that I can't screw up my car, as long as I took my time and was fairly carefull. The key is having the right tools. It took me a couple of trips to Wal-Mart to finally buy everything
I needed, but it wasn't expensive and now I have tools to make additional mods to my Smart.
The challenge of working on a Smart engine, there is very limited space in the engine compartment to remove and add components. The best tool I purchased was a mini torx bit wratchet that's about 3" long for $10 at Wal-Mart. I could get into tight places with that tool, where most tools couldn't go.
Most people take a short cut and hacksaw the air pipe out of the engine compartment. I wanted to try and salvage mine, just in case I want to reinstall the cold air intake on my next Smart. It was a feeling of satisfaction when I was able to remove the air pipe without taking a short cut to do so. However, it didn't keep me from flinging it like a frisbee across the yard. Lol