The Great ARK Design FR-S / BRZ Super Exhaust Shootout, Part 1
The FR-S/BRZ twins are proving to be somewhat difficult cars to tune. The FA20 engine is in a pretty high state of tune from the factory with a very high compression ratio and a lot of eletronic nannys. It is hard to get the car to consitantly read power on a dyno to where you can accurately measure a gain of 5 horsepower or so.
At MotoIQ we have a formula for dynoing an FR-S/BRZ. Fill car with 91 octane or the best fuel you can get in your area. Drive the car for around 10 minutes to warm it up well. Strap the car down on the dyno, monitor the engine with an OBDII scan tool, start it up and run it at low load in 4th with the dyno fans blasting until the coolant temp stabilizes. Run the car several times until it is consistent, allowing the temperature to drop to the point where the radiator fans shut off before starting another pull. This is also important so the oil temps don't get very high. Whew, now you can do a baseline. Repeat after every change.
So since we've learned how to dyno the FR-S/BRZ the hard way, it is now time for us to compare several exhaust systems from ARK Design. ARK Design, proud sponsor of the Team America Time Attack team is a manufacturer of exhausts, intakes, clutches, wheels and electronics. We have reviewed several of their parts before and have always been pleased with the results.
ARK Design makes 3 high quality exhausts for the FR-S/BRZ twins. The three exhausts are tuned to please everyone from the picky daily driver to the hard core street/track guy. ARK Design makes the Road Spec exhaust for those who want a mellow exhaust that is not too loud and with styling that matches the stock car well. The Super Flow exhaust is for guys who want the highest flowing exhaust, like people running forced induction, having internally built engines or Nitrous. Finally, there is the Racing Spec exhaust for those who want light weight, low backpressure and who are not too concerned about noise level.
Three exhausts, three different types of anticipated end use. How do they stack up on the dyno? Read on and we will find out.