mb1604

i have the motoria catback exhaust http://cgi.ebay.com/ebaymotors/ws/eBayISAP...TRK%3AMEWN%3AIT

it comes with a cat... now when i buy my header, will i have to buy another cat or will the header link up with the exhaust without it?

javageek

That thing it comes with is not a cat. It is a straight pipe, that they call a cat for some reason.

hamhead

EDIT: Oops, your looking at that thing. Thats a racing cat, its not really a cat just a straight pipe. You will need a high-flow cat to pass emissions, etc. However if you buy a high flow and link it up to where the straight racing cat/test pipe will go, it will link up.

mb1604

ok, so if i get the obx 4-2-1 on importshark(when its back online) ill be all set?

hamhead

OBX comes with a racing cat as well I think... If your running an exhaust that replaces the second cat (one in the exhaust path) you will need a high-flow catalytic converter to replace it with. An aftermarket header replaces the cat on the manifold. You will then need to replace the racing cat (Read: Straight pipe) with a high-flow cat and extend the 2nd O2 sensor after that cat in order to not throw a CEL and pass emissions.

mb1604

ok, just so i got this, ill have to use the cat provided by header maker, then buy a 2nd cat to replace the straight pipe?

hamhead

I'll try and explain this better. Right now your exhaust is like this:

(Stock Header with 1st Cat)--(Downpipe)--(2nd Cat)--Piping--(Muffler)


When you replace the exhaust it'll be like this.


(Stock Header with 1st Cat)--(Downpipe)--(New Piping)--(Muffler)


When you replace the Header it'll be like this:


(Aftermarket Header, no cat)--(Downpipe)--(New Piping)--(Muffler)


Now you can't pass emissions as you have no cats. So you buy a high-flow.



(Aftermarket Header, no cat)--(Downpipe)--(High-Flow)--(New Piping)--(Muffler)

mb1604

ill be doing header and exhaust at same time, i can do new header, downpipe,cat(provided by header maker) piping then muffler right?

x7xstring

Looks nice, do you know what it sounds like before you bought it?

what does it sound like?
Im just wondering as I am in the market for an exhaust upgrade.

mb1604

havent put it on yet, its going on in may, when i get out of school and snow is gone,
hammhead, so will new header downpipe, cat(that came with header) piping then muffler work ok?