The original exhaust system was straight from the Toyota iQ (it even has Toyota stamped on the tip). While cat-back systems are available from commercial sources they are limited to a single tip with flow through muffler. R-Tec Auto Design have previously installed a twin tip exhaust system onto a Cygnet, and a similar system was installed onto KM12ZSZ. However, the original choice of tip looked rather large for the car and a smaller more discreet size with a more muted sound was retro-fitted by ProFab. Return to KM12ZSZ.