Toyota V8 - Cat or no Cat?

Ozrover, I have recently seen the Redback system on the 79 V8 straight through (no cat, resonator/muffler) and while it sounds great I don't think I could stand it as a daily drive.

The Cat is optional and from what I was told not a requirement, as diesels are in a different category.
From what I have read, it is not so easy.

Gov regulations

I was told that the difference in through put is minimal so it does roduct full flow and turbo spin up and power.

So for the extra $120 it is worth having the Cat so that your vehicle is sure to EPA test.

I have the same vehicle Jeff and looking to do the same. From what I am told it is illegal to not run a cat if it is standard fitment on the vehicle, you will see on most ads that sell the exhausts online have a note saying "for offroad use only" for the models without a cat as it is illegal onroad

Also from what I have been told it does not effect performance either as most supply a 'Hi-flow' version, likewise you can go straight through after the cat without a muffler or resonator and they do sound great but as a tourer the noise may get to you at some stage as I know a couple that have done this and later fitted a resonator because of the drone.
Hope this helps

Cheers

Thanks all, makes my choice easier now.

If it is petrol and it came with a cat converter the vehicle will be illegal without one.......the belief that cant converters are restrictive is not accurate...if they are in good order they should make no difference to the air flow.

If it is a diesel it should not have a cat converter...if it has anything it will have a diesel particulate filter...again same legality issues......don't know about the restrction issue if in good order.

IF however the DPF is clogged due to not reaching high enough temps for long enough to burn the particles, they most certainly will become restrictive...solution a highway run.

cheers

Yes go with a hi flow cat and all is good. I recently did my Hilux and it peaked at 624nm with the Steinbauer and hi flow cat so there is no restriction on performance.