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cheesesliceking
Original Poster
890 posts
109 months
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ScoobieWRX
4,797 posts
95 months
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Yours is a WRX so you have a cat (Precat) in the uppipe before the turbo, one in the downpipe (main cat), and another at the end of the downpipe (Scrubber). Then you have a long middle pipe with the resonator, and then the muffler (backbox). It's not a case of getting the wrong one, it's about the noise that comes out the exhaust. The resonator takes the edge off the sound and smooths it off almost muffling it. If you want a nice proper burble leave it out. If you don't mind about the burble leave the resonator in to muffle the sound a bit. Personal choice thing  ETA: The pipes you are looking at are straight cat replacements, there are no resonators in them. The resonator is normally on the long middle pipe not the scrubber replacement. The pipe you need is the decatted stainless steel item.
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myles1972
516 posts
40 months
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Ive fitted the cat delete (after the downpipe, which causes a cat efficiency engine light, but no actual issues. I also removed the resonator, before the backbox, which releases a bit more burble.
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amccan10
489 posts
47 months
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cheesesliceking
Original Poster
890 posts
109 months
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ScoobieWRX said: Yours is a WRX so you have a cat (Precat) in the uppipe before the turbo, one in the downpipe (main cat), and another at the end of the downpipe (Scrubber). Then you have a long middle pipe with the resonator, and then the muffler (backbox). It's not a case of getting the wrong one, it's about the noise that comes out the exhaust. The resonator takes the edge off the sound and smooths it off almost muffling it. If you want a nice proper burble leave it out. If you don't mind about the burble leave the resonator in to muffle the sound a bit. Personal choice thing ETA: The pipes you are looking at are straight cat replacements, there are no resonators in them. The resonator is normally on the long middle pipe not the scrubber replacement. The pipe you need is the decatted stainless steel item. top stuff thanks! I think i got confused what goes where in the order of things, so many cats! If you get a sec, which one does this one replace, is it the scrubber which if i understand it right is the rear cat? --> http://www.ebay.co.uk/itm/140846702071;jsessionid=...Just bought the exact one above ( relisted) !,i thought it was the rear cat, then i saw diagram and it looked a lot like the rear section with the resinator box on. so confused, i shouldnt be allowed on ebay alone! thank you again!
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myles1972
516 posts
40 months
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amccan10 said: Thanks, I should have said I had it mapped out.
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ScoobieWRX
4,797 posts
95 months
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cheesesliceking said: top stuff thanks! I think i got confused what goes where in the order of things, so many cats! If you get a sec, which one does this one replace, is it the scrubber which if i understand it right is the rear cat? --> http://www.ebay.co.uk/itm/140846702071;jsessionid=...Just bought the exact one above ( relisted) !,i thought it was the rear cat, then i saw diagram and it looked a lot like the rear section with the resinator box on. so confused, i shouldnt be allowed on ebay alone! thank you again! Looks like the scrubber replacement, not a great photo though. Personally i wouldn't have gone for the PPP, a smooth straight through pipe is the way to go to promote fast and smooth gas escape, and it looks better too but each to their own.
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cheesesliceking
Original Poster
890 posts
109 months
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Thanks budd, I get what you mean about free flowing, was only £27 though, if I had more spare cash I'd go with your idea.
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ScoobieWRX
4,797 posts
95 months
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Fair comment!! That dreaded word...DOSH!! Do you what you can when you can 
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cheesesliceking
Original Poster
890 posts
109 months
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That's my moto mate damn kids insist on being fed and clothed
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paulmoonraker
2,260 posts
32 months
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ScoobieWRX said: cheesesliceking said: top stuff thanks! I think i got confused what goes where in the order of things, so many cats! If you get a sec, which one does this one replace, is it the scrubber which if i understand it right is the rear cat? --> http://www.ebay.co.uk/itm/140846702071;jsessionid=...Just bought the exact one above ( relisted) !,i thought it was the rear cat, then i saw diagram and it looked a lot like the rear section with the resinator box on. so confused, i shouldnt be allowed on ebay alone! thank you again! Looks like the scrubber replacement, not a great photo though. Personally i wouldn't have gone for the PPP, a smooth straight through pipe is the way to go to promote fast and smooth gas escape, and it looks better too but each to their own. The two prodrive de-cat pipes I have had did not have a resonator box on them. That one on eBay looks odd. The resonator on the Impreza is located on the long centre pipe which connects the 3rd cat (scrubber) to the backbox.
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cheesesliceking
Original Poster
890 posts
109 months
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paulmoonraker said: The two prodrive de-cat pipes I have had did not have a resonator box on them. That one on eBay looks odd. The resonator on the Impreza is located on the long centre pipe which connects the 3rd cat (scrubber) to the backbox. Do you think the thing i bought could be the centre pipe that connects the scrubber CAT to the rear box then? and not the rear cat itself? ta
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paulmoonraker
2,260 posts
32 months
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cheesesliceking said: paulmoonraker said: The two prodrive de-cat pipes I have had did not have a resonator box on them. That one on eBay looks odd. The resonator on the Impreza is located on the long centre pipe which connects the 3rd cat (scrubber) to the backbox. Do you think the thing i bought could be the centre pipe that connects the scrubber CAT to the rear box then? and not the rear cat itself? ta It's about 4 foot long the centre pipe. No, what you have is the 3rd cat, I just don't think its a prodrive one.
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ScoobieWRX
4,797 posts
95 months
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paulmoonraker said: ScoobieWRX said: cheesesliceking said: top stuff thanks! I think i got confused what goes where in the order of things, so many cats! If you get a sec, which one does this one replace, is it the scrubber which if i understand it right is the rear cat? --> http://www.ebay.co.uk/itm/140846702071;jsessionid=...Just bought the exact one above ( relisted) !,i thought it was the rear cat, then i saw diagram and it looked a lot like the rear section with the resinator box on. so confused, i shouldnt be allowed on ebay alone! thank you again! Looks like the scrubber replacement, not a great photo though. Personally i wouldn't have gone for the PPP, a smooth straight through pipe is the way to go to promote fast and smooth gas escape, and it looks better too but each to their own. The two prodrive de-cat pipes I have had did not have a resonator box on them. That one on eBay looks odd. The resonator on the Impreza is located on the long centre pipe which connects the 3rd cat (scrubber) to the backbox. That eBay pipe isn't long enough to be the long middle pipe with resonator. It looks like a short replacement for the scrubber, however, it looks like it actually has a cat on there so not sure what it's meant to be. Is it Prodrive??
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paulmoonraker
2,260 posts
32 months
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ScoobieWRX said: That eBay pipe isn't long enough to be the long middle pipe with resonator. It looks like a short replacement for the scrubber, however, it looks like it actually has a cat on there so not sure what it's meant to be. Is it Prodrive?? The Prodrive one has a heat shied which is bolted to a metal bit that sticks out. If you see it you'll see straight away its a heat shield and not a cat. I cant see from the photo on eBay if its the heat shield or not...
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ScoobieWRX
4,797 posts
95 months
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I don't think it's a heat shield.
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paulmoonraker
2,260 posts
32 months
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ScoobieWRX said: I don't think it's a heat shield. Nor do I. Which begs the question - is this a Prodrive bit of kit, or some other strange aftermarket cat that perhaps is used when the downpipe is de-catted?
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cheesesliceking
Original Poster
890 posts
109 months
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Thanks for the help guys :0)
Glad someone else knows more than me!
I messaged the seller to ask if was tw third/rear CAT for sure. Response below, I don't really understand most of it! I don't want to bad mouth the guy, as he's replied etc just not sure what he's talking about!
Reply below:
"hi, this is 2nd decat, came off a wr1 which don't have up pipe cat so has resonator to keep noise down inside. Newage scoobs have up pipe cat, then downpipe cat (bolted to turbo) then 2nd cat, then centre pipe n back box. seems to be a myth around that the centre pipe is a cat but I've never seen 1 that is, there either straight pipe (sti) or resonated (wrx)"
Does that make sense?
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paulmoonraker
2,260 posts
32 months
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cheesesliceking said: Thanks for the help guys :0)
Glad someone else knows more than me!
I messaged the seller to ask if was tw third/rear CAT for sure. Response below, I don't really understand most of it! I don't want to bad mouth the guy, as he's replied etc just not sure what he's talking about!
Reply below:
"hi, this is 2nd decat, came off a wr1 which don't have up pipe cat so has resonator to keep noise down inside. Newage scoobs have up pipe cat, then downpipe cat (bolted to turbo) then 2nd cat, then centre pipe n back box. seems to be a myth around that the centre pipe is a cat but I've never seen 1 that is, there either straight pipe (sti) or resonated (wrx)"
Does that make sense? Not really. The WR1 has a prodrive sports cat in the downpipe (I actually had one on my old STi). So I dont know why it would have a cat in the scrubber pipe. For sound reduction you have a resonator, but thats in the centre pipe (the long one). FWIW - the STi has a resonator, contrary to what he says above.
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cheesesliceking
Original Poster
890 posts
109 months
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Cheers buddy, so it seems he might not really know all about it, damn it.
One additional question if you have a sec, does it look like the original OEM standard rear CAT without its heat shield on?
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