The RB320 only had one cat in the down pipe standard.

 

Gaz.

i ran my standard hawk for almost a yr with a cat back system which i never remapped or needed changed for mot's.
it was loud enough but compared to other scoobs with afterburner etc it wasnt that loud on tickover but great on boost.

ive got a 3" downpipe with 100 cell sports cat afterbruner centre and haywood and scott backbox and the car sounds amazing,been driving around like that for 2yrs,
just swapped the backbox over for the afterburner one as i wanted the burnt tip.

look at the link below, if you change number 1/2 then u will need a remap.
and instead of having a 4 piece system you can buy the longer downpipe which makes it a 3piece system,

http://www.scoobypedia.co.uk/uploads..._schematic.gif

 

Thanks tom

Going by the diagram i would want to change the mid pipe, rear pipr and back box
Ive been thinking about getting blitz nur spec r

 

Just a wee update for anyone that finds this whilst researching:

I've just fitted my Ninja 2 backbox to my otherwise standard system on a Hawkeye, the difference is amazing! Should have done it as soon as I got the car. Sounds great, nice subaru burble, no drone, really pleased with it.

As Rob had suggested earlier, no need to change anything else if all you want is a better sound.

Almost worth the epic battle I had getting to old backbox off...

 

2006 sti (hawk) as standard...

http://s1214.photobucket.com/albums/...1092011036.mp4

2006 sti (hawk) with afterbunrer vortex cat back....

http://s1214.photobucket.com/albums/...9092011038.mp4



EDIT: Have done around 4k miles now and it is.... louder shall we say

 

yes they have 2 cats it will fail and should show engine management light i have one and i have a straight through stainless and ive kept the old one for mots

 

Anymore fro anymore on this subject ?

Sold my Classic and picking up a Hawk on Tuesday so hoping it has a similar boxer growl

 

All UK Subarus are pretty much the same in standard form, its the aftermarket that makes the difference . You shouldn't expect to much from any standard Subaru.

 

My blob is equal headers full decat which doesn't really burble

I'm going to order an unequal soon I think

 

Are they not equal length due to it been twinscroll?

If it is twinscroll ordering unequals will take away what made it such a good car!

Why you would make the car worse is beyondme!

 

It's not just a case of swapping bud, you'll need to remap too, and if you gave a decent EL setup you may lose torques by installing UEL.

EL will sound like an evo
UEL will burble.

Rob