But surely an aftermarket manifold is more free flowing than Oem despite retaining a cat??Yes.
But surely an aftermarket manifold is more free flowing than Oem despite retaining a cat??
It would have to follow the same shorty 4-1 design to be able to have a section for the cat like the OEM.
A full race header can have a proper 4-2-1 design with secondaries that a stubby design cannot incorporate. It's the uncompromised arrangement that leads to most of the gains. Pipe diameter also obviously helps.
And what about without an O2 spacer, only negative that EML displayed?o2 spacer does NOT make A/F ratio safe, only trick your ECU into thinking it is so it doesn't display an EML on the dash.
It is strongly advised that you get a remap if you changing the OEM cat to anything but OEM spec.
It's actually a 200 cell cat mate.And as said a 100cell cat wont pass mot, the piper cat (one of the best aftermarket cat options) mentioned is hit and miss to pass when really hot.
If you are going to the effort of swapping the mani, might as well get the most out of it and go 4-2-1
And what about without an O2 spacer, only negative that EML displayed?
It's actually a 200 cell cat mate.
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o2 spacer does NOT make A/F ratio safe, only trick your ECU into thinking it is so it doesn't display an EML on the dash.
It is strongly advised that you get a remap if you changing the OEM cat to anything but OEM spec.
Fair enough, obviously if it requires a remap then it's not worth it as I may as well go down the 4-2-1 in that case, like I said I'm trying to avoid that.
My OEM cat doesn't look like it will last much longer which is why I was considering this as a replacement. I assume a new one will be extortionate & a used one will be pretty much the same condition as mine by now. I'm not keen on using an OE spec one, ECP have a 'React' branded catalytic converter for sale but I can't be sure that it's built to the exact same specs as the original anyway.
Hence my hoping this would be a case of swap and go whilst 'upgrading' to SS in the process.
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