Manford

Will the sports cat from a WR1 fit a 2003 wrx?

There are two cats in the standard exhaust, I've read a few places saying the car will pass its mot with only one? I'm not convinced but if so,does it matter which one is retained?

I don't want to change the back box for a dustbin and I dont want to spend loads, but freeing up so horses that are already there cant be a bad thing

Coleyo2c

If it's any help, I have a sports cat in my downpipe and second cat delete. Mines 100cell and has to be hot to pass emissions apparently by the previous owners words. It has passed though... I have a h&s sports cat downpipe. My cars a 2004 wrx.

scooby_Paul

i think the one straight after the turbo in the downpipe has to be kept but not 100% certain

Athame1

iTrader: (2)

Do you know a "friendly" MOT station?

or

Are you able to remove,re-fit it for each MOT?

also freeing those ponies, I think, you may need a new map(not sure)

RS_Matt

There are 3 cats in a 2003 WRX exhaust.

stealthy1

Yeah,if de-cating downpipe,you will need a remap.So probs not best if you don't want to spend to much.
You will be ok deleting the other,but as previously mentioned its probably best running it through MOT with a hot system.

jaygsi

iTrader: (46)

Just taken mine for mot 100 cell sports cat, had to take it for a 4 miles thrash to get cat to pass mot

Manford

3 cats, jesus! i thought two was bad.

one in the up pipe, and two under the car?

I can swap it back and forth,its only a couple of bolts at either end, so not a big job.

Surely the ecu will adjust small amounts, and the lower restriction on the exhaust will let the car run more easily without a remap? a remap would just make sure your getting the most?

so.....use a sports cat and delete the other with,



?

Coleyo2c

If you buy a sports cat it generally goes from the turbo to the centre section of the exhaust deleting the second cat. So less joints more flow etc.

Athame1

iTrader: (2)

This may help

http://www.subaru4you.co.uk/how4.shtml

Gambit

iTrader: (6)

Just find a prodrive sportcat and second cat delete. They pass mot

Manford

Just find a pro drive cat.........know of any going?

Mine has the wrsport/pro drive backbox how do I tell if the car just has a backbox or the whole prodrive pack? I know the ecu n exhaust is different,but how do I identify?

Coleyo2c

Your car will have a prodrive certificate and a shiny sticker saying the power increase in bhp. If you don't have this it's probably best to assume it hasn't.

Dockyard

Contact subaru as all proper PPP have been logged on the cars file.
I didn't get a certifcate or shiny sticker with mine but I bought from a dealer but I still checked to make sure

Manford

Shiny sticker where?

phsyo

Japspeed sports cats:
https://www.scoobynet.com/925823-spo...elivery-6.html

Oil change guide:
https://www.scoobynet.com/general-te...nge-guide.html

dave_t

iTrader: (1)

Its just a case of what are you trying to gain and how much money do you want to spend.
Let us know a little more about it & you'll get some good guidance..

Just fitting a sports cat etc will not get good results...
Pound for hp, the best results are:
1. delete the small scrubber cat and replace pipe (easy job, £40)
2. S/Hand deresonated CAT back system (could be as cheap as £80 if you are not too fussy)
3. Remap (o/source via RaceDynamix)

All the above will leave you totally MOT friendly.

Do items 1&2, gain maybe 5-10 hp.
Add item 3 & you should be from 225 to around the 270...(around £470)

Yes you could fit a sports CAT, but it'll cost you £100 plus the pigging around to fit...to gain another 5????

Manford

I wana spend as little as possible, usual story. I dont want 500bhp or anything crazy, just a little more, and if i can improve the mpg as well then that cant b bad?

I'm getting more and more tempted with the open source remap.

Car has a back box, need to get underneath the car and have a look if its just that or anything else.

Small scrubber cat? is that with the pipe (pic)above?

jaygsi

iTrader: (46)

Someone selling a sports cat here

https://www.scoobynet.com/subaru-par...down-pipe.html

Athame1

iTrader: (2)

Mpg after a remap will be slightly improved ( it's what you tell the mrs.)until you drive it harder( don't tell her that bit).

What power are you hoping for?
As mapping for mpg won't really work out.

Manford

Bit better pick up and a bit more power is the aim