Quieter exhaust
 

howdy,

Ive got a 3" bore turbo to backbox exhaust on my 93WRX with no restrictions.
Im looking to quieten it down for day to day driving as my neighbours are going to lynch me because I leave for work at 6am on my early shift.

Ive searched the threads on exhausts/backboxes and im wondering that as my exhaust system is 3" bore can I use a 2.5" bore backbox or would that restrict power? ( I have'nt seen a 3" bore backbox with a lot of sound deadening only 2.5" bore ones)

my backbox at the mo has hardly any sound deadening...4" tailpipe 6" diameter backbox!

cheers peeps:notworthy

i have a prodrive system it sounds fantastic try and get hold of one

Cheers mate.

Anyone else suggest a quieter 3" bore backbox?

The other way to reduce the noise is to have a middle section with a resonator instead of the straight-through pipe.

Ive spoke to a few 'custom' exhaust people and they've said that a middle resonator won't fit due to the fact that ive got 3" bore pipework...basically theres no room to weld it in without it catching the bottom of the car.

Strangley enough they're more that happy to make me a middle section from 2 1/4" bore pipework for £150:cuckoo: ......2 1/4" bore? yeah right, "thats what we fit to all scoobies" came the reply....

Better backbox with more sound proofing I think.

can you get a bung made to fit your backbox? they do them on afterburner vortex`s.

I do have a bung for the backbox which I have'nt fitted yet but im gonna have to on my early shift before the neighbours go mad.

Only problem is that I need something permanent and ive heard that the bungs restrict performance...not good

I'm sure magnex do a 3 inch backbox? Nice sound from a magnex system.

Milltek are are great for a balance of sound and power

Hi There

Hyperflow do a product called Active Exhaust System. These are made in Australia were you get a ticket for having loud exhaust systems. The Active exhaust is basically an electronically controlled throttle body in the exhaust stream. By creating back pressure in the exhaust by reducing its effective cross sectional area the noise of the exhaust is reduced. The computer supplied with the system continuously moniters the back pressure via its own map sensor and varies the butterfly to give the same back pressure in the system whatever the throttle positoin is. So effectivley you set the noise level you want and the system takes care of the rest. You can swicth it off in the cabin if you want or have it constantly modulating mapped to throttle position or exhaust back pressure. If using throttle position its quiet on part throttle untill you floor it, then its fully open and causing no restriction. These systems are now bieng fitted as OE on Jag,Lambo,corvette to name a few, but Hyperflow is the only effective system available to the aftermarket. Its an excellent product for track day use with the ever decreasing noise levels we have to abide by and eliminate the need to change back boxes etc.

cheers, Andy

Hi there mate. iv got a HKS drager system which im looking to change for a louder one. its 3" system with a 4" tip.
maybe we can come to a agreement? have you got any pics of your system?

cheers
Ben

Magnex mate. Nice Scooby burble without being obtrusive and easily bearable on the motorway. Good quality kit and perfect fit. Made in the UK!

Try RoadRunner website.

Revolution....one of the quietest full 3 inch on the market

Damo

How does the Ninja compare with the Magnex & Revolution exhausts - anyone ?

Thanks for the replies guys.

STI Ben,

mate id love to take you up on the offer but mine is a powerflow jobbie that a friend of a friend did for me ( a bit of a foriegner late one evening for £100) so its a bit rough around around the edges...no disrespect to Powerflow but the guy who did mine could'nt bend 3" perfectly. Does the job though:)

get a standard STi muffler and have it re flanged to fit the 3 inch centre pipe.

or get a 2.5 inch inlet muffler, and same deal, flange it to the 3 inch system.

a number of people over here in oz are starting to run 2.5 mufflers on 3 inch systems, because they get better performance out of it, particularly mid range.

plus they are generally quieter on the road.

MY99-MY00 STi mufflers are great though, i have one and it flows awesome and is very quiet, still nice and growly when the pedal is pushed though.

You're in 'stralia !!!






I'm jealous !! :cry:

australia is great, uk looks cool though too, especially the wrx scene, from what i can tell from hanging out on scoobynet ;)

iw ant to go back to oz:( had the best time ever there

if looking a subtle exhaust id def suggest magnex, looks good, sounds just right and fine in the m'way at 70mph, nice gains too

I think ive sorted it.

At the mo im using the exhaust bung to quieten it down on my early starts for work.....really kills power though.

Im looking at a G-sports 3" exhaust or a HKS hyper 3" exhaust:norty: ....the G-sports is £50 cheaper though.

Obviously I know HKS are the dogs danglies but does anyone know if G-sport are any good?

cheers Nathan