We do have other options if this particular system does not fit your needs! This link should take you to all the different exhaust options we have as of now and the options that we will add in the future.
Regardless of cost, I know, for a fact, without a doubt, that smart Madness has tuned the 453 to have definite increases in speed and quickness. They have a program and a few mods that will have that car threatening to outgun stock performance of larger 4 cylinder compact cars even. Maybe not an all-out zero to 60 race (I actually believe it will win its fair share), but certainly some pulls between 50 and 70mph, or 50 to 90mph pulls, or 25 to 50 pulls, etc,.
They even let me borrow a car for a while and it was a definite enhancement over stock performance. It was easily noticeable, and actually bordered on being too fast for most drivers to handle.
Mister_smart, we are glad to hear that you enjoyed driving the smart! We actually just got our 2nd Crossblade here at our facility (pics to come soon)! We like to offer everything we can for the variety of customers and fellow smart enthusiasts that we encounter. It is an honor to be part of this community, and we can only see ourselves moving forward!