Cat Size...

[R34_Wong]

I've had two CATS supplied when I bought the car (just some spare stuff that came with it) and want to mount one in now. They both have 3" openings, but one is rather wider/fatter while the other is definately slimmer and lighter.

Now I know with this info it's not enough to determine which would give better flow, but would anyone have any ideas?

Thanks!

[kessian]

What brand are they both?

[R31Nismoid]

well the larger one in theory should flow more

if it does or not remains to be seen