Mark89dawson

I have a 53 blob sti that drones so loud it's just not worth driving
It's had a 3" toyosport on then a 3" milltek now a 3" cobra track day everything is tight and leak free it's got quieter with each exhaust when you give it the beans but seems of droned even more under normal use anyone got any ideas?
Cheers

Vxr2010

Just get an exhaust place to weld an intermediate silencer in , possibly around the 100£ area , make sure exhaust tip finishes after bumper and not before , I did not look where you are but Top Gear / Emp in Stalbans herts are good

Ash

I had the same issue with mine. It was too loud and not what I was looking for at all.


I spoke to Kev at SCR who recommended the below kit. Its nice and quite and when you give it some beans opens up the burble.


http://shop.scoobyclinic.com/index.p...product_id=207

Have a look at my build thread and you can see it fitted ect.

JDM_Stig

iTrader: (3)

What was wrong with the Miltek exhaust ?

Mark89dawson

It sounded lovely for a week then got louder and droned like mad finished up setting car 2 alarms off next door when I fired it up cobra is near enough the same and getting louder its mounted on the milltek large bore downpipe and even that has a resonator so I'm wondering if that could be at fault?

JDM_Stig

iTrader: (3)

Id say something went wrong as they are known to be a nice exhaust, Cobra after Miltek wouldn't have been a step I would have suggested if honest, I know Cobra do a track friendly exhaust, but all others aren`t known for being subtle.

Mark89dawson

It is the track one!

BBB3

iTrader: (7)

miltek FTW

TECHNOPUG

iTrader: (1)

The resonator is shot?

Mark89dawson

That's what I'm thinking the guy I bought it off sold it because it was too quiet a week on my car it was deafening! Anyone have a milltek or a cobra track day what are they like in the car?

Mark89dawson

One other thing I'm wondering is the last owner had it ages and put a loud exhaust on a few months before selling it if he wanted it louder is there anything else he or a previous owner could of done to make it loud or let the noise into the car when it was standard or could mapping affect anything?

yabbadoo4

iTrader: (8)

ive not long decatted my milltek for my map with andy f and it sounds real nice on boost and theres no droning at all with it (it didnt before either)

Mark89dawson

Just tapped along the exhaust with a rubber mallet and the downpipe rattles
could this cause the drone?

BLU

iTrader: (27)

Pardon??

Its the back box, they are very loud! I have the standard 2 cats, standard centre section (with resonator) and a Cobra back box and its F*ckin loud!

daveriley123

iTrader: (1)

I have an rcm resonated center section for sale that will quieten it down a lot if your interested. Was only on the car for about 100 mile so is virtually new.

Mark89dawson

even the track day? It was a bit quieter than the milltek when it went on but has gotten louder!

Mark89dawson

Will that work with the milltek? If so how much you looking for?

TimH

iTrader: (11)

I've seen the welds on the turbo flange of a Milltek downpipe broken on several examples. Worth checking maybe?

sy.

iTrader: (8)

Had similar Issues full 3" + decat + twin scroll = drone. Being twin scroll I wanted to try keep the sound deep without any scaffold pole type roar so I had a custom 4"x16" resonator ( internally 3") fitted to the mid section, however the fujisubo back box wasn't right, tried a few back boxes ironically ended up with a hks super dragger originally from a classic reworked to fit my Hawkeye. Sometimes custom work is better ( oh and agree with above some of the so called big name down pipes have poor welds) which is made worse when heat wrapping them as said cant beat a few custom welds.

Mark89dawson

Will that mate to the milltek? It so how much you looking for?

JDM_Stig

iTrader: (3)

arent Miltek full systems split in a different place to the standard system?

InTurbo

iTrader: (3)

Mounting flanges are slightly rotated to stop you using them with other systems,
But you can easily grind them off and re position them.

JDM_Stig

iTrader: (3)

hairy muff, I knew Id read something was unusual about them.

scotty boy 80

iTrader: (5)

Im in the same boat mate got decat with ninja bbox and it does my head in really loud inside the car gonna fit a resonated centre and take it from there then prodrive back box will probably be next

InTurbo

iTrader: (3)

I've got a Miltek 3'' decat resonated turbo back, found it quite intrusive on the motorway.
I had a extra resonator added to the centre pipe and it didn't make much difference, although it did make the exhaust note deeper it didn't reduce the drone.

What I found to be very effective was to remove the rear seats and boot flooring and add 3 layers of sound proofing.

First I added dynamat to all the metal panels to reduce resonance. This included under the seats boot floor and inner rear quarter panels inside boot area.

The I added a thin layer of sound insulating foam covering the whole boot floor down to the rear foot well.

Then on top of the foam I added a 2mm layer of mineral loaded acoustic mat.

After cutting the odd hole for the seat belt buckles and mounting bolts, I reinstalled the seats and boot carpet,

You would never know it was there but the drone is massively reduced, can't even here the exhaust at 70 mph in 6th.

You could take this even further and get some self adhesive acoustic foam with a mass loaded mat built in to add to the rear quarters and inner boot lid.

Mark89dawson

Believe it or not I've also tried this using a very expensive sound insulating underlay I've used at work and it made a little better in town but on the motorway it seemed to reflect exhaust and the road noise almost like a bass enclosure and the insulation in the rear quarters made the car steam up really bad so the Ac had to be on all the time and the extra load made it worse!

InTurbo

iTrader: (3)

Shouldn't use underlay, it holds moisture and can cause corrosion or damp problems.
Purpose made car sound deadening won't hold moisture.

The correct way of stopping the noise is to first stop the panels resonating, and acting like a drum by using dynamat.

Then you need to add mass loaded sound deadening mat this has the same sound stopping qualities as lead!
But for it to be effective it needs to be insulated from the bodywork,
This is why you need a thin layer of closed cell acoustic vehicle foam.

Non of these materials will absorb water or dampness, unlike porous carpet underlay.

JDM_Stig

iTrader: (3)

in your first post you didnt say if it was full decat or sports cat`d, mine has a sports cat, centre res box and Scorpion BB, I have no drone and subtle deep tone when tootling around, but on WOT it just sounds like a Jet fighter, no issues on the motorway,

You really need to attend a few meetings and get people to take you for a drive with different exhaust combinations to find one you, like rather then word of mouth.