Have got an STI backbox fitted to my 01 wrx, with the centre silencer and cat removed, however I'm after a bit more of the flat four burble. Could I achieve this by cutting off the tail pipe and welding a straight through pipe on in its place? Or is removing the downpipe ect. the only way? not so keen on doing this due to emmisions and cel

Thanks Paul

 

Different backbox should do it.
Some thing like an Afterburner or Blitz

 

Cant I just cut the tailpipe off then?

 

Sounds like its gonna fail anyway with the cat removed! as its illegal,so u cant be that bothered about emmisions! However to answer your origanal question go with an Afterburner Vortex back box from scoobyworld. that will cheer you right up.. and NO cutting!! pls!! Willsy

 

Errr the exhaust system has three cats on , I have only removed one and it passes the mot no probs. My original question was........ if I cut the tailpipe off will I get more burble? I know I can buy another one

 

I know it has 3 cats! But sometimes they can fail emissions!Depending on which one and how many etc! however!! If you mean just cutting the end of the pipe that comes from the back box pressure bit then, no it wont make any difference mate. Which cat have you removed by the way? Willsy

 

Removed the one in front of the centre silencer. I just thought with the backbox I have, the outside dia. of the tailpipe is 3", inside it narrows to about 2" which cuts out the amount of noise coming out? Hope you understand Just thought if this was cut off and a 3 or 4" straight through tube was welded on it would increase the noise?

 

Yes mate i know what you mean and it wont make any difference, even the awesome afterburner vortex narrows inside, but there are other factors that create the flow/noise/back pressure. Just opt for the said back box or complete cat replacement pipe back vortex system i promise you will be happy! Willsy

 

Bollox, more expense the wife will kill me Cheers Willsy

 

Sorry mate, but scooby's are money sucking ****'s!! take a look on www.scoobyworld.com it shows a nice view inside the end of the exhaust! and if your only gonna get a back box its 279 squid ish! Willsy

 

Your right there

 

If you're after something a little more subtle (both in looks and sound) than an Afterburner, I can recommend the Scoobysport/Janspeed backbox. It's a stunning piece of kit and is just about loud enough at idle and when pootling about, but it bloody roars when the car is driven "properly".

****. I want to go for a spin, now

Kev

 

Thanks Kev

It was just something someone at work had done to his MGB, he had bought a powerflow backbox and changed the tailpipe which had changed the sound. He seemed to think I could achieve the same with my STI box, something to do with the flow of the exhaust fumes coming through a straight through pipe.

 

If you were to cut out the backbox and replace it with a pipe then it would be loud.

Bob

 

No, not the back box, just the tailpipe coming out of the backbox. Might give it a go anyway, nothing to lose

 

Why would you want to do that

I would either just leave it as it is or buy a new backbox.

If you want to do it on the cheap...remove the backbox

Bob

 

STI backboxes dont seem to fetch much, decent new ones are £200-£250?

Can you run it without the backbox????

 

Yep. Just weld on a pipe in its place. Plods might not like it but they wont like anything that is loud. Would expect a custom exhaust place to do it for you for around £50 without butchering your sti exhaust.

Bob

 

Cheers Bob, I see someone wants to start a ninja group buy might do that instead, bloody hell she'll kill me, oh well

 

Hey mate,
I also have a centre decat plus silencer replacement pipe on my MY01......

but I also have an afterburner vortex!
The sound is awesome

I had a power engineering backbox on it before (without a centre decat) and it sounded nice and burbley.
I reckon it'd still sound good (but quieter) if I were to put this back on with the centre decat and silencer replacement pipe in place.

I'm looking to sell the Power engineering backbox for £100 if you're interested (paid £280 new).

 

Not sure m8, I thought the STI might give me a bit more noise but hasn't really done the trick. Does the Power engine one give a noticeably burbly sound? Dont really want to splash more money on one thats quiet right.

 

The STI backbox wont give you any more burble over the standard peashooters as its not a straight through design like most (or all) aftermarket backboxes, its designed to keep the car pretty quiet.

My old Power Engineering backbox gives a sound comparable to the likes of say a Scoobysport box, i.e. it's not stupidly loud, but you can certainly here the burble. It makes the car sound as it "should".

That was how it sounded on the car before I had the decat centre on there remember, so I'm sure it would sound even better on a car with a decat centre.

 

Whats the condition of the box? how many miles had you had it on the car

 

The box is in good condition.
Must've done about 5-6k with it on.

Details from the Power Engineering website:

http://www.powerengineering.co.uk/ac...OWERt75backbox

 

Thinking of going for the Ninja, thanks anyway

 

Cool, no worries mate.
Hey, why stop there? You could go the whole hog and get the afterburner!
Might wanna think of a way to soften up the mrs first though!

 

Blitz Nur Spec R

 

Cheers guys