Finally took the plunge - New 427SC kit on order!

[sambo]

Originally Posted by Paintwerks

I kept the 1200km old OEM cats off my E3 HSV when I put the 3" Walkinshaw system on. I also have a pair of brand new Outlaw 200cpi Euro III cats too that fit the Walkinshaw system. Which cats should I use?

I'd say the HSV cats have a better chance of passing the IM240 than a set of aftermarket "Euro III" cats.

According to the following info, Euro 4 came into effect for new passenger vehicles in 2008. There are special rules for ICVs but with Euro 5 and 6 being phased in, I wouldn't count on Euro 3 being acceptable for too much longer. Perhaps an engineer can chime in here?

Emission Standards: Australia: On-Road Vehicles and Engines

[400TT]

Originally Posted by sambo

I'd say the HSV cats have a better chance of passing the IM240 than a set of aftermarket "Euro III" cats.

Sambo, yes I am of the same belief, you can bank on the performance of OEM cats. Just keep in mind that not all OEM cats perform the same, it all depends on how "dirty" the original engine is compared to the emissions level they are trying to meet. kyleb mentioned he used XF Falcon cats for that reason.