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Recent thread by Metal_Head titled "Rear Muffler Delete" included posts about an ideal exhaust system size application for the Aurion. Preliminary research confirmed his suggestion of replacing the last catalytic converter with a 3" version as an ideal starting point for an improved flowing exhaust system. On the 40 series Aurion, there is a very large resonator after the catalytic converter. Approx, exhaust pipe measurements [after the flex joint for the front Y pipe] increase from 60mm to 72mm so this should readily accommodate fitting a 3" high flow stainless steel catalytic converter. In theory, there should be improved exhaust flow which hopefully will result in better fuel economy and acceleration particularly on the highway. Nice theoretical musings then Karma came to the girlfriend's birthday celebration on Sunday along with an unexpected windfall. Phoned a Brisbane Southside Exhaust shop today and accepted his phone quote of $240. Car is now booked in for Thursday morning. I will give a follow up about whether this change was worthwhile or save your $$$- 12 replies
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