Having spent the last two months looking at Scoobies and and numerous posts on here and the rest of the internet I'm still none the wiser! Way back when, I owned a Classic UK spec Turbo, it burbled!! Not too loud but very destinctive and enough to satisfy. I've recently delved back into the market and drove a couple, one Blobeye, think it was an 05, heavily modded, sounded brilliant but decided against it, then most recently drove a Hawkeye, totally standard and was very disappointed with not only the exhaust note but the actual sound under the bonnet!! There wasn't a distinctive Scooby burble to be heard. The Astra SRi we were part exing sounded more meaty. I was suprised/gutted/disappointed. I've read about "equal length headers" and obviously replacement cats/back boxes but am none the wiser with conflicting information about both the 2.5 uk engine and "equal/unequal" length headers. My question, am I best going for the totally standard Hawkeye WRX >2006 (2.5) and spending the extra gaining a burble in the process with exhaust/cat/manifold upgrade or going for an older Blobeye <2006 (2.0) I prefer the look of the Hawkeye but don't want to sacrifice the soundtrack of a true Scooby.

Please help!!

Thanks in advance

Gareth

 

its the unequal headers that make the rumble, the jdm twin scroll equal length headers dont.
the uk cars should all burble but the noise will be louder depending on exhaust

 

Thanks for the quick reply, there was no burble! Lol. The ad said it was a 2006 WRX (Hawkeye) it had a single chrome (maybe 3") tailpipe. It only had one lady owner so was totally standard. As I said in my previous post there was no rumble from the engine either! Wiki says its the EJ255, is this right? 2.5 turbo flat four? From reading everything it sounds like they tried to kill the burble with the outlet manifold and exhaust system.

 

if its a uk car it should have an unequal length manifold, this is what makes the burble although a standard exhaust will hide it, fit an aftermarket exhaust and possible decat and it will burble.

 

Mine does uk 2007 hawkeye STI..Cat back Blitz nur spec R system..

 

Cheers fellas, Lee does your STi have equal or unequal length manifold?

I expect 100% it's unequal ��

Strange this WRX sounded like a Forrester! Lol. Wondering now whether it was an import.

http://www.autotrader.co.uk/classifi...true?logcode=p

Thoughts?

Really appreciate the help, thank you

 

Yes gaz mine has unequal length manifold as should all uk cars unless they have been changed by the owner..

 

Mine does, I think the standard exhaust with 2 cats and center resonator pipe masks it abit. Me thinks yours has standard zorst on.

 

when i got my hawk, i to was gutted it didnt sound like it should..

its because of the standard exhaust, it just chokes the life out of it. both with power and sound.

if you want it to burble you have to change the exhaust..

 

The standard WRX exhaust has a twin tailpipe. The 56 plate dates it at about the time they were giving away a PPP free, with a single tailpipe; it's probably got that fitted for c. 270bhp. Get a proper exhaust on it and a remap and you should see 290 with a better noise

 

The burble is entirely due to the headers and uppipe in use. Generally cars with twin scroll turbos and equal length manifolds scream like a 4 cylinder Jap motorbike but cars that burble have the OE cast headers or an unequal length tubular exhaust but the decision to go with a tubular exhaust will depend on the power you extract from your turbo and indeed what turbo it is. Ported headers will extenuate the burble when done properly.
If noise is so important to you why not get an electric drill and put a couple of 3mm holes in your downpipe. That costs nothing and only takes half an hour of your time.

 

Standard hawk wrx only has single tailpipe, I have only seen the twin on blob and earlier.
As above though fit a de res centre and decent backbox and it will be better, if you also want to remap then fit a second cat delete and panel filter as well.

 

It is not the tail section that makes the burble, that comes from unequal headers and the conventional uppipe. Fit equal length headers and you lose the burble.

 

From reading the OP's 2nd post it sounds like the exhaust is almost standard. Have you ever heard or driven a Standard Spec Subaru, they are almost completely noiseless.

Try searching on youtube for answers

example searches standard exhaust then aftermarket:
http://www.youtube.com/watch?v=iWJahoSWCHI

EL vs UEL
http://www.youtube.com/watch?v=GnUPHEcX3JY

As said though the pitch/tone changes with different setups too, so headers, up pipe, types of materials.... I believe Titanium offers a much more crisper sound ?!?

Rob

 

Hi Gareth,

I have a 2006 Hawk from new and was quite amazed at how quiet the exhaust was, absolutely zero burble, but happy that there was no annoying boom on the motorway.
Like the others say, the burble comes from unequal length headers which are standard fit but on the Hawk it is silenced into mediocrity by the factory exhaust system.

More recently, I changed the standard exhaust for :- middle section > Afterburner resonated, rear section > Scoobyworld Racebox.

Result = scooby burble, no cabin boom, great sound when giving it some gas and passes sound check at Oulton park for track days (102dB)

AJS

 

i have a hawk sti and was gutted when i got it as it didnt sound like a scooby, put a catback on it and sounds just like it should now. the burbles just muffled by the exhaust. put a cat back on and you wont be dissapointed with the hawk

 

First of all, thanks for all the help, really appreciate the time you take to reply and share your knowledge, secondly, I'm proud to announce that after a 2 and a half hour journey (stuck in traffic for an hour on the M6) we've found just what we were looking for. A black 06 Prodrive WRX Hawkeye with a very, very nice exhaust note!! 59k miles with only two owners. We couldn't have done it without you LOL. I'll get some pics sorted ASAP, it's pretty standard to look at now but some cosmetic mods are planned ASAP. 18" alloys, STi boot spoiler, lowered with black mesh lower grill. We've part exed our existing car so we're really chuffed with the deal. Thanks to Barclay Motors for letting us view the vehicle at 8pm tonight, at his home!!! Cant wait to pick the car up Wed/Thurs!!

Thanks y'all

Gaz & Gem

 

My 2006 STI

http://www.youtube.com/watch?v=v7Lj4SZiDjI

Prefer it standard now

http://www.youtube.com/watch?v=kOefkDiJePg

 

Well done mate you will not be disapointed sounds like a lovely car..

Get some pics up next weekend..[img]/grinning-smiley-17116.gif[/img]

 

I have the same issue with mine, have put up with it for a year but now the lack on any subaru noise is bugging me!

Just picked up a Ninja 2 via the for sale section here. At the risk of a semi hi-jack, will this give me the burble we all look for or should I change the resonator out too?

Cheers

A

 

Are you going to have the car remapped?

Rob

 

Have you read any of the posts from Harvey in this thread, its the unequal length type of exhaust manifold that gives the burble the type of cat back you have will only determine how loud it is

 

He hasnt said anything about his spec, so you can only assume he has a uk car with a standard exhaust!?!?

You cannot/hardly hear the burble with a standard exhaust, so by changing the back box should give him the desired noise, but could potential cause a little over boost without a remap

The Burble is created by UEL headers, how loud it is would be created by the exhaust post Turbo, and more so for the back box.

The Flatter (evo/big bike) sound is created by EL hearders.

 

Is that that 'tuner'/RR place that used to be in Witham, Essex?

 

Yes mate went to the wall a few years ago

 

Yeah, that's what I heard.

But you could easily see that occurring TBH.

 

I hadn't planned on it, looking to keep the rest standard as it's my sensible daily driver.

As Rob guessed it's a UK (WRX) and completely standard, so no issues with regards to headers. The car does have a little of the 'subaru' sound, but only if you go and sit with your head next to the exhaust and only really on initial start up, so just need the volume turning up a few notches for my own amusement.

Hadn't really thought about changing out the cat to bb pipe until today as not fussed about any potential power gains in the future, but if i'm going to be under the car anyway. But if you don't think i'll need it for desired effect i'll not bother, no point wasting pennies.

Cheers for the info and opinions.

 

Just change the back box then, and watch it for over boosting!

Rob

 

Excellent, cheers Rob

 

Does the hawkeye sti have two cats?
Where?
Will hawk it still pass MOT if you remove the second cat