Recommended decat downpipe
10 April 2020, 06:15 PM
#1
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Recommended decat downpipe
Car: 2004 blobeye WRX
Been researching for the past few weeks on a Decat downpipe for my car. Decided to make an new topic to get some upto date information and recommendations. Already have a scorpion backbox, standard downpipe and centre cat, standard centre resonator.
I was planning on the Hayward and Scott downpipe 3 into 2.5inch long version to delete both cats. However I recently found a few topics with serious quality concerns on them which has pushed me to make this topic. Other topics seem abit out of date to get a good opinion from.
What decat downpipe is recommended, I’m after 2’5inch and good quality, hassle free fitment. I’d also consider second hand items if anyone happens to be selling a decent downpipe. New to Subaru scene (coming from r32 skylines) so any links to downpipes would be ideal as I notice there’s a lot of Subaru specific shops in the uk
Cheers guys
Been researching for the past few weeks on a Decat downpipe for my car. Decided to make an new topic to get some upto date information and recommendations. Already have a scorpion backbox, standard downpipe and centre cat, standard centre resonator.
I was planning on the Hayward and Scott downpipe 3 into 2.5inch long version to delete both cats. However I recently found a few topics with serious quality concerns on them which has pushed me to make this topic. Other topics seem abit out of date to get a good opinion from.
What decat downpipe is recommended, I’m after 2’5inch and good quality, hassle free fitment. I’d also consider second hand items if anyone happens to be selling a decent downpipe. New to Subaru scene (coming from r32 skylines) so any links to downpipes would be ideal as I notice there’s a lot of Subaru specific shops in the uk
Cheers guys
Last edited by LeonWRXL; 10 April 2020 at 06:16 PM.
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12 April 2020, 04:59 PM
#6
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13 April 2020, 07:09 AM
#8
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I found a couple of topics saying they where poorly made and welds were not very good. And for the price I didn’t want to risk that when a Japspeed downpipe is half the price and from what people where saying same poor quality
13 April 2020, 08:29 AM
#9
i also ran japspeed de-cat downpipes on my last 2 impreza's, a wrx @ 354bhp and a blob sti @ 440 bhp without issue. yes its a budget brand and some of their products may be ill-fitting but in my opinion their downpipe is fine.
toyosport are the brand to avoid, never heard any good feedback on anything they sell.
if im correct H&S make most of the exhausts for scoobyworld like the vortex/raptor/ninja etc and there must be 1000's out there without issue
13 April 2020, 08:29 AM
#10
Even if you get a poor weld, their customer service is good, and exhausts have a lifetime warranty as long as not tracked. However, a friend with an identical spec c hatch not only had to return his when new with fitment issues, but it then failed an mot within 15 months, and as he had tracked it there was no warranty. But those are the ts&cs.
13 April 2020, 08:33 AM
#11
Even if you get a poor weld, their customer service is good, and exhausts have a lifetime warranty as long as not tracked. However, a friend with an identical spec c hatch not only had to return his when new with fitment issues, but it then failed an mot within 15 months, and as he had tracked it there was no warranty. But those are the ts&cs.
13 April 2020, 10:09 AM
#14
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Cars on 135k miles, I don’t plan on ever running more then Td04 power (280-290bhp).
I already have a 2.5inch scorpion backbox so just looking to decat the downpipe and second cat and keep the standard 2.5inch centre section and my scorpion back box.
other mods include prodrive y pipe, free flowing filter, walbro pump and once downpipes done it’ll be remapped to suit
I already have a 2.5inch scorpion backbox so just looking to decat the downpipe and second cat and keep the standard 2.5inch centre section and my scorpion back box.
other mods include prodrive y pipe, free flowing filter, walbro pump and once downpipes done it’ll be remapped to suit
Last edited by LeonWRXL; 13 April 2020 at 10:11 AM.
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13 April 2020, 10:56 AM
#16
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I shouldn’t have any issues with MOT’s with decat, know a few that would be willing to let it go.
based on this would you still recommend the seperate sections as opposed to the single pipe that deletes both cats together
based on this would you still recommend the seperate sections as opposed to the single pipe that deletes both cats together
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14 April 2020, 05:32 PM
#19
Scooby Regular
The above picture is what I’m using on my current car at 360bhp and I will be keeping that set up with a 3” cat back aiming for 430-450 with my new turbo.
I would personally go with the 2 parts, not everyone would agree but you could save yourself a lot of hassle if you can just throw your second cat back on if you ever need to.
Scorpion are the Subaru - PPP parts and fit perfectly.
Dont forget new gaskets for turbo to downpipe, downpipe to secondary cat and a new doughnut gasket to your centre section.
Siv.
I would personally go with the 2 parts, not everyone would agree but you could save yourself a lot of hassle if you can just throw your second cat back on if you ever need to.
Scorpion are the Subaru - PPP parts and fit perfectly.
Dont forget new gaskets for turbo to downpipe, downpipe to secondary cat and a new doughnut gasket to your centre section.
Siv.
14 April 2020, 06:21 PM
#21
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14 April 2020, 06:25 PM
#22
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http://scoobyworld.co.uk/catalog/pro...oducts_id=4794
15 April 2020, 12:20 AM
#23
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15 April 2020, 07:01 AM
#24
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The h+s downpipe with scorpion centre decat is basically same price as the full cobra downpipe. Will there be much difference in the build quality and fitment between the two? Just looking to do the job once and be hassle free once fitted
15 April 2020, 05:19 PM
#25
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Originally Posted by Samj
Is that the one shown at the below link? Does this just connect to the standard centre section without issue?
http://scoobyworld.co.uk/catalog/pro...oducts_id=4794
http://scoobyworld.co.uk/catalog/pro...oducts_id=4794
15 April 2020, 05:27 PM
#26
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You should seriously consider replacing your up pipe with a STI one which is cat less unlike your existing WRX one. MattyB will have them in stock usually fairly cheap at £40. I believe it is safer going full decat rather than retaining standard uppipe but I am no expert. Guys on here will advise you properly ?
15 April 2020, 06:04 PM
#27
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You should seriously consider replacing your up pipe with a STI one which is cat less unlike your existing WRX one. MattyB will have them in stock usually fairly cheap at £40. I believe it is safer going full decat rather than retaining standard uppipe but I am no expert. Guys on here will advise you properly ?
i know one issue is the Uppipe cat breaking up and causing turbo damage
15 April 2020, 06:35 PM
#28
Scooby Regular
I have a cobra downpipe with h +s centre and h+s custom back box, fantastic sound from my car,proper Subaru burble
16 April 2020, 08:33 AM
#29
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personally would not advise running a full de-cat whilst retaining the "pre-cat" up-pipe as they have the potential to overheat and then break up once the downpipe cat restriction is removed............
the GC8 or new-age STi up-pipes are catless and a direct replacement although I would run a Harvey Smith 'trick' up-pipe but then maybe slightly biased..........
the GC8 or new-age STi up-pipes are catless and a direct replacement although I would run a Harvey Smith 'trick' up-pipe but then maybe slightly biased..........
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16 April 2020, 10:34 AM
#30
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personally would not advise running a full de-cat whilst retaining the "pre-cat" up-pipe as they have the potential to overheat and then break up once the downpipe cat restriction is removed............
the GC8 or new-age STi up-pipes are catless and a direct replacement although I would run a Harvey Smith 'trick' up-pipe but then maybe slightly biased..........
the GC8 or new-age STi up-pipes are catless and a direct replacement although I would run a Harvey Smith 'trick' up-pipe but then maybe slightly biased..........
also do I have to do the mod to get rid of eml related to Uppipe or can this be removed during the remap?