Remove centre section of exhaust
24 August 2007, 08:02 AM
#1
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Remove centre section of exhaust
Just about to order the de resonated centre section for my newage STI PPP. Does this just replace the resonator section or the CAT aswell? If so, when I replace it will it fail the MOT?
If so, I presume it is just a case of switching the pipes before an MOT?
If so, I presume it is just a case of switching the pipes before an MOT?
24 August 2007, 08:38 AM
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I'm about to do the same thing, my understanding is it just replaces the resonated section and stops short of the cat. If you are talking about a centre section such as scoobyworld or hayward and scott sell.
you can get a seperate decat cat pipe for £100 new.
anyone please correct me if I am wrong
you can get a seperate decat cat pipe for £100 new.
anyone please correct me if I am wrong
24 August 2007, 11:48 AM
#4
yep, just the resonated pipe is replaced - I went for the resonated centre section to keep noise down.
It was a nice fit and very, very shiney
Edit: and no, replacing it shouldn't make you fail your MOT (unless the MOT person is cranky and thinks it's too loud). In fact, you should be able to remove the centre cat also (as long as you've got the PPP downpipe)
It was a nice fit and very, very shiney
Edit: and no, replacing it shouldn't make you fail your MOT (unless the MOT person is cranky and thinks it's too loud). In fact, you should be able to remove the centre cat also (as long as you've got the PPP downpipe)
24 August 2007, 01:13 PM
#5
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Assuming your car is pre 06, then the centre has a silencer and NOT a resonator, removing it liberates more noise but almost nothing in the way of power.
Removing any cat is contrary to construction and use regs, and whilst it may pass an MOT its illegal, that's not to say I havn't done it, but just to make you fully aware!
Simon
Removing any cat is contrary to construction and use regs, and whilst it may pass an MOT its illegal, that's not to say I havn't done it, but just to make you fully aware!
Simon
24 August 2007, 02:50 PM
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I want more power but I dont want it to be too loud so would it be worth getting
an aftermarket backbox coupled with the original centre section (to keep noise down) but a decat cat pipe, instead of cat back system?
an aftermarket backbox coupled with the original centre section (to keep noise down) but a decat cat pipe, instead of cat back system?
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24 August 2007, 03:38 PM
#8
I've got the following:
ppp backbox
afterburner resonated centre section
centre decat
ppp sport cat downpipe
gt spec headers and up-pipe.
I don't think it's too loud at all, my engine makes more noise than the exhaust when "going for it". I've never driven the car with just a ppp backbox, so I can't compare, but the noise at the moment is not at all over the top in my opinion
Edit: obviously it's a bit louder than the standard twin pipe exhaust, but not really louder than the normal PPP WRX's I come across.
ppp backbox
afterburner resonated centre section
centre decat
ppp sport cat downpipe
gt spec headers and up-pipe.
I don't think it's too loud at all, my engine makes more noise than the exhaust when "going for it". I've never driven the car with just a ppp backbox, so I can't compare, but the noise at the moment is not at all over the top in my opinion
Edit: obviously it's a bit louder than the standard twin pipe exhaust, but not really louder than the normal PPP WRX's I come across.
24 August 2007, 03:50 PM
#9
You've not got a CAT in the centre section of a PPP Exhaust, all you've got is the Prodrive Sports CAT in the downpipe. So by replacing the resonator/silencer with straight through section will give you better sound along with a better throttle response. One of the best Mods i made when i did mine
24 August 2007, 05:15 PM
#11
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Id be interested to see what u guys think after you have done this. Im looking to do the same on my 05 PPP i dont want it too loud like a nova a civic or some chavved up scoobs i just want a tad more volume with out going ott!!
24 August 2007, 05:36 PM
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Replaced the centre section of my MY05 STI PPP with a Japspeed stainless section and it was well worth doing - gave more burbble but not too loud.Certainly sounds a lot better and deeper than with the standard middle section.
24 August 2007, 05:57 PM
#14
Then click on Video, thats my car with a straight through Afterburner centre section & Afterburner backbox, that should give you some sort of idea what the volume is like
24 August 2007, 06:22 PM
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I've got the following:
ppp backbox
afterburner resonated centre section
centre decat
ppp sport cat downpipe
gt spec headers and up-pipe.
I don't think it's too loud at all, my engine makes more noise than the exhaust when "going for it". I've never driven the car with just a ppp backbox, so I can't compare, but the noise at the moment is not at all over the top in my opinion
Edit: obviously it's a bit louder than the standard twin pipe exhaust, but not really louder than the normal PPP WRX's I come across.
ppp backbox
afterburner resonated centre section
centre decat
ppp sport cat downpipe
gt spec headers and up-pipe.
I don't think it's too loud at all, my engine makes more noise than the exhaust when "going for it". I've never driven the car with just a ppp backbox, so I can't compare, but the noise at the moment is not at all over the top in my opinion
Edit: obviously it's a bit louder than the standard twin pipe exhaust, but not really louder than the normal PPP WRX's I come across.
Why did you replace the standard centre pipe with another resonated one?
24 August 2007, 07:05 PM
#17
24 August 2007, 08:01 PM
#18
Yeah i had the PPP exhaust on before the Afterburner and yes it is a fair bit louder, but thats not the main reason for having it, the PPP backbox is quite a restrictive one and by having the afterburner i find the turbo spools earlier and seems to pull harder from lower revs
25 August 2007, 06:56 AM
#21
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I like the stainless steel look and I believe the standard diameter on a WRX is 2.25" as opposed to the 2.5" I went for. Doesn't sound like a big increase but it's actually a 23% increase in cross area. Hopefully it will survive longer than a standard section as well, so I can fit it once and forget about it
Simon
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