cat vs no cat with DPF delete

[TBentley]

Ok so how much more of an improvement will you get by removing the cat as well with a DPF delete?

[shapiros]

Not sure anyone will be able to give you an accurate assessment here. Too many variables.

Have you looked at the setup? Before I decided, I looked at the CAT-> DPF connection and there was no doubt, it had to go. However, if you do leave the CAT on, remove the counter weight that is in front of the CAT. It is obviously there because of the DPF.

Sig

[superdutydixie]

removing them both makes for a easier install if they need to go back on.

[04hdfatboy]

is the cat in the downpipe?

[superdutydixie]

no, the cat and dpf are connected together after the downpipe

[DSTRBD]

If you are removing the DPF, do the cat at the same time. Not only is it more beneficial power and mileage wise to remove the cat with the DPF, it is also MUCH easier to install.

[04hdfatboy]

Originally Posted by DSTRBD

If you are removing the DPF, do the cat at the same time. Not only is it more beneficial power and mileage wise to remove the cat with the DPF, it is also MUCH easier to install.

So will a downpipe back exhaust get rid of the cat or do i need a turbo back exhaust? Also what is the benefit of a downpipe?

[DSTRBD]

Yes, a down-pipe back kit will get rid of the cat and DPF.

The down pipe is 4", but it is a bit crimped. Most people just leave it stock, but those trying to lower their EGTs as much as possible or those that race will swap it out.