Ozzy_555

Looking to get an Afterburner 3" Catback from Scoobyworld but at first i was gonna get the Vortex backbox with a De-Cat package, What's the differences in the sizes? What's my best option?




Cheers

dunx

iTrader: (3)

3" is better for people chasing huge horsepower, don't worry about it !

LOL

DunxC

Ozzy_555

Best exhaust out of the 2 for loudness/deep burble and maybe a little bhp?

Cheers

dynamix

iTrader: (3)

About 1/2 inch


It would need to be a full 3 inch system to see any benefit I would have thought.

Ciaran

iTrader: (16)

U beat me to that dynamix
Im running a standard PPP RB5 and am going full 3" seeing as i am changing the exhaust. I have no plans for massive power but would kick myself if i was told in 18 months that my exhaust was causing a restriction. It can not do any harm to go 3" can it?

Mr_White

iTrader: (1)

I was told that unless you're aiming for 350bhp+, that you'll end up losing low/midrange torque and power with a 3" system

No idea how true it is though, I haven't been able to test it.

STI_Baly

iTrader: (23)

I have a HKS super drager 3" straight through and i assure you there was no power loss on my motor.

But then again it was mapped 2 months after, to truly benefit from the mods.

Ozzy_555

So.... by the sounds of things i don't really need to get a Afterburner 3" Catback seen as i'm not really looking to remap my scooby.

James Neill

iTrader: (1)

I understood that a 2.5" is good for 360bhp. Anything over and you need a 3" exhaust. I have a 3" revolution system. It's no noisier than my old 2.5" system.

silent running

If we're talking about from the turbo back, then going bigger has no performance disadvantages at all. The trade-off is of course the extra noise and in some cases, weight of the system. But performance wise, bigger is better from the turbo back.

mshill

iTrader: (4)

Thats what well all said when we bought a scooby
make more sense to go 3" , then when the modding bug takes over your exhaust is already sorted

i got the full 3" afterburner r system including decat downpipe from scoobyworld, sounds awesome

Ozzy_555

Yea my thoughts are swaying more to the 3" afterburner system sounds like a nice loud sounding exhaust on the youtube vid i watched earlier

53

iTrader: (41)

Doesn't the catback couple at 2.5" though ? you aren't buying any mod advantage in advance as you won't be able to fit a full 3" system. If you are buying 3" for performance do it properly turbo back or for better burble get a NurSpec S or similar which has the 3" back box pipe connecting at 2.5" but benefits from a deeper burble from the 3".

help2003

iTrader: (1)

Ive just got my 3" decat downpipe fitted to day from exhaustsuk, already had corba 3" bore with 4.5tail system and before i have the decat down, it sound nice, but sound a hell of alot nicer now lol,

Before i got all that i only had the 2.5" bore with center decat and magnex back box, yep sound nice under load but you could not hear it while driving slow, since having the full 3" fitted the car feels alot stronger while driving,

Mr_White

iTrader: (1)

Does anyone actually do a sports cat downpipe that's 3", opposed to narrowing down to 2.5"

James Neill

iTrader: (1)

Was looking for one last month actually. Found this

ExhaustsUK: Suppliers of Cobra Sport Performance Exhausts (see SU20 under Direct Fit|Subaru and down the page)

But never inquired further. Just went for a 3" decat in the end

dynamix

iTrader: (3)

Milltek 3 inch system has a true 3 inch bore throughout inc sports cat version.

joz8968

iTrader: (13)

I have a Cobra 3" system and love it (mated to a 3" twin divorced-port decat downpipe). Makes a fantastic deep growl, overlaid by the flat-4's # dugga dugga # burble - but without being stupidly over the top.

The straight-exit 4" rolled-in tail isn't stupidly sized either, and looks like a 22B's, or a slightly larger Classic STi's, so is in keeping with the OEM pattina. Also, the resonator box is all but the same diameter as the tailpipe, so it looks like a straight-through item - really mean (I hate ugly oval resonators, lol).

Finally, they are good value for money... I won mine on eBay, a brand new system (centre section and back box) at £113 !!!.

Ozzy_555

While we're talking exhausts if i fitted a Catback exhaust and a Sports cat downpipe instead of a straight thru downpipe would i need to remap?


Does this look good value for money: Ebay # 350105023129

James Neill

iTrader: (1)

Wouldn't bother with ebay for exhausts - too much of a lottery and some that simply don't fit right. Do some research on here.

PS - I have a 2.5" Ninja 100 cell sports cat downpipe for sale - £150

Austrian Impreza

iTrader: (9)

So a 2,5" decat system would not be good for anything above 400bhp?
Is this the truth, please let me know!

MarkC

iTrader: (12)

would a 3inch catback system fit to the standard 2.5inch downpipe lads??

car is a impreza type r

help2003

iTrader: (1)

would have to find out if the 3" catback comes with the flange for 2.5" to bolt to the downpipe, am 90% sure it will

joz8968

iTrader: (13)

Most 3" cat back systems do have a reduced flange to mate to the OEM downpipe's 2.5" flange, by employing the standard fitment wire-wool 'donut' cone gasket.

However, if the flange doesn't reduce, i.e. is still at 3", then I think it will still bolt up to the d/p, but you'd have to use a conventional 3" flat 'diamond' shaped gasket instead.

MarkC

iTrader: (12)

thanks lads

Austrian Impreza

iTrader: (9)

Does anybody know an answer?

Mother Theresa

I'm sure a 2.5" system will work just fine, it's just whether a 3" exhaust will work better.

I don't know of anyone that has done back to back trials [and I have kept this sort of topic under review as my BHP has edged towards 400 and I still have the (albeit decatted) PPP system].

jasonius

iTrader: (1)

Something to think about, a decent, well designed 2.5" system will perform much better than a poorly designed 3" system..

Basically, you get what you pay for.

Ozzy_555

Afterburner Vortex Backbox owners do you have angled or straight exit?



Cheers.

StuS

iTrader: (5)

Angled