v8 jdm

hi i have been told my 2003 wrx sti jdm jap model has no centra cat as standard but i have taken the centre section off and it does have a cat why?

TonyBurns

iTrader: (3)

No it has a resonator box in the centre, just a cat in the downpipe.

Tony

v8 jdm

hi my exhaust is in 3 pieces back box centre section has a little box, then got another bit it looks like a cat is got a lamda sensor hole and when you look inside it, it has like a mesh inside like a civ???

TonyBurns

iTrader: (3)

Yup its a resonator box, JDM cars only come with 1 cat, UK cars have 2.

Tony

v8 jdm

thanks for the info, are you sure its not a cat as someone was selling the same exhaust on ebay for a uk and the cat in the pick looked the same as mine, my exhaust is in 3 parts to, i am goin to order a downpipe for a twin scroll but not sure if i should now as it might have a different turbo on??:also that cat thing bolts on to the downpipe then the centre section bolts on to that??tthumb:

TonyBurns

iTrader: (3)

100% sure there is no cat in there, owned my MY03 for 4 years brand new, they only have one cat and thats in the downpipe, also answered your question if its a twin scroll model or not, if it sounds like a jet plane then its twin scroll

Tony

stevebt

iTrader: (8)

if your worrying that your car isn't a JDM check the log book as the vin code only has about 5 numbers, when I had my twin scroll fitted the car sounded like a bike on acceleration

v8 jdm

hi yes only has 5, its just that ive orderd a twin scroll downpipe but if i have a cat it must have a different turbo on it? i dont thin it has a burrble but it pulls at about 3000 revs? i have a pic of cat how do i up loads it to put it on this thread

stevebt

iTrader: (8)

I wouldn't worry about the cat, they may of added the older style cat pipe from classic to help get it thru the ESVA test ?? as I had to pay £330 out for a specific pipe to get mine thru

v8 jdm

hi tony here is my exhaust is it a cat? http://i29.tinypic.com/smsro3.jpg

stevebt

iTrader: (8)

that looks like the exhaust from a uk car?? the smaller part is a 2nd cat on a UK car before joining the up pipe !! that makes your exhaust a 4 piece as in downpipe (1) next cat (2) centre section(3) and back box (4) that isnt right as it should only be a 3 piece exhaust !!

scoobyjay7

Just to make things clear
You have a up pipe which has a cat in it (from the headers to the turbo)
then you have a down pipe (from the turbo) which has a cat in it
Then you will have a second cat (small piece after the down pipe)
Then you will have a centre section (with a resonator)
Then finaly your back box
This is what i had on mine which is a 2002 wrx jdm

stevebt

iTrader: (8)

JDM WRX doesn't help him if he has ordered a twin scroll downpipe as the STI only has the twin scroll turbo

scoobyjay7

I thought they had the same exhaust set up (nothing to do with the turbo)
In your last post you had said there was a " 2nd cat on a uk car before joining the up pipe"
My headers join my up pipe

stevebt

iTrader: (8)

I'm only guessing just like you

DIPSY

Jdm sti 03 onwards equal length headers,twin up pipe no cats in there feeding the two ports to the Vf37 twin scroll or Vf36 twin scroll on the spec c .

IanK Spec C

You can tell from the exhaust note if it's a twin scroll. The equal length manifolds looses the legendary flat four throb on the twin scroll. So does it sound like a beetle at idle ?

Best regards,

Ian

v8 jdm

iam not sure mate new to scoobys but my mate had a 95 wrx sti and it does sound different, if i took a pic of the turbo would you be able to see if its a twin scroll? is there any other way to find this out? my head is baffeled why it has a centre cat??? i got told the uk has the cat near the rear but mine has it bolted to the down pipe?

v8 jdm

turbo is a vf35 is that a twin scroll??

stevebt

iTrader: (8)

vf35 is a single scroll turbo from a uk/euro car

v8 jdm

would you know why it has a vf35 turbo on it as its supposed to have twin scroll?? also what downpipe would i need?

IanK Spec C

Hi,

what makes you think yours is a JDM version? May be worth taking to a Scooby specialist to see what they reveal alternatively your chassis code my reveal more details?

JDM Chassis no.s are a lot shorter than euro ones.

Best regards,

Ian

p.s. Whether it's a euro or a JDM it's still a scooby so don't get too depressed ;-)

v8 jdm

hi its got 5 chassis numbers, just gutted as dont no why the hell its got a vf35 turbo.

stevebt

iTrader: (8)

since they went to the trouble of changing the whole exhaust system !! are you sure its a JDM engine ?? The heads of the JDM are far superior to the UK counterparts

sti danny

ask zen

v8 jdm

iam not sure if its a jdm engine now, if it has had a new turbo and exhaust were has the second lamda sensor come from?? does the sensors go into the ecu or engine if it goes in the engine it must of had a new engine???

DIPSY

I bet your not a happy chappy buying a Jdm Sti and its not quite the real deal