Well today i took the plunge and got the exhaust done at Hi Tech Mufflers Sydney straight through exhaust from the turbo back.. sounds alot deeper too but not overwhelming, also changed the air filter to a K&N air filter. They have given me the original stuff so in case their is an issue with warranty i can put it back.. but.. all in all the car feels quicker, deeper, and you can actually hear more air being sucked into the car.. it feels and sounds awesome.. ill take some shots of it as soon as i can and give you a full rundown on how things go.. but other then that im happy :D Thanks to Lambros for an excellent job.. In regards to the computer detecting changes ive been told that the cat is in the same place within the chain so the computer should not notice any difference at all. (this is what they told me). I had a look at the Dyno sheets from the car that was for City Ford 180 Rear Wheel KW and after with the exhaust 197.. im not too sure how they work things out but im pretty sure that means the car is now 257KW? maybe someone can correct me? The car ive been told is now 271KW.