99greenwagon

iTrader: (39)

hi,ive recently fitted a 3" h&s backbox to my car.it is mated to a full turbo back 3" decat and it is fookin loud!if i used a resonated centre would it massively reduce the noise?ive come to the conclusion that a resonated centre will not be enough to make it a sensible noise level.so......
can anyone recommend a backbox that is true 3" and fairly quiet?
but hopefully nothing to raspy?
any suggestions would be appriciated.not looking to spend a fortune,just want something to tone the noise down a bit,thanks.

sprigeteer

iTrader: (9)

Ive a full 3" jetex - sensible noise levels at 400+.

aRSekicker

I have a full 3"system also, i have a cobra sport and that is not that loud i wanted an after burner but this came along first, your welcome to come and compare and swap if interested ? Located in Burton staff's

99greenwagon

iTrader: (39)

hi,too far for me matey,i like the sound of the h&s but it just so loud,its ok on motorways but for normal driving through towns/villages its borderline rediculous. what style of backbox is the cobra one you have?

99greenwagon

iTrader: (39)

the jetex looks quite nice but it would mean i would also have to replace the centre section which i dont really want to do as its brand new,do you know if jetex do a 3" backbox that is the normal length and will bolt up to a normal centre section?(as it looks slip jointed,not a bolt up flange?)

MattyB1983

iTrader: (51)

I'll swap with ya. I have a true 3" tornado back box.

99greenwagon

iTrader: (39)

matty,do you know much difference in noise levels between a non resonated centre section and a resonated one? is it minimal or does it actually reduce the noise levels by quite a bit?
how loud is the tornado box?

MattyB1983

iTrader: (51)

A resonated section does quieten it down quite a bit mate but it ofcourse depends just how loud it is to start with. For instance, you could fit a resonated centre to a Nur spec and it would still be crazy loud.
The tornado box does sound nice, doesn't drone at cruise speed and can be quiet when just pottering about. Open it up and it comes alive though.

99greenwagon

iTrader: (39)

it is bugging me slightly as i do love the sound of the h&s,its aggresive,just a bit too loud,im going to try the resonated centre section first and see what happens,if its still too loud i may take you up on your offer,would you say the tornado is any quieter than the h&s?
when i had the 2.5" h&s it was almost too qiuet so i thout the 3" would be ok.....
a bit of a shock to the system,i started it,sounded nice,tickled the throttle a little whilst stationary and omfg!

sprigeteer

iTrader: (9)

I suspect they are all slip jointed, but it may be worth contacting them for a custom box?

chocolate_o_brian

iTrader: (22)

I would be tempted at either having a custom back box made to suit your needs (as there's been a few threads where you're trying to find that 'right' sound level), or maybe try a track back box by the likes of Revolution or Cobra.

Centre resonator just helps with the cabin drone. I found the tailpipe size affects the sound too. I have a 4" tailpipe on my 3" system that replaced a 4.5" one. It's a tighter note and quite deep (both Cobra btw so too loud for yourself).

99greenwagon

iTrader: (39)

the daft thing is,there dosent seem to be much cabin drone at all,it just seems very loud on normal driving,it sounds great when you plant your foot down,just the overall sound level is a bit much.im hopeing the resonator will reduce the volume a bit?

chocolate_o_brian

iTrader: (22)

In that case you just want a more resonated/baffled back box with a smaller tailpipe. Job done.

99greenwagon

iTrader: (39)

so if i put a resonated cc on and keep the same backbox will this not quieten it down?

MattyB1983

iTrader: (51)

It will, we just fitted something similar to this ---

http://www.ebay.co.uk/itm/130600158740?redirect=mobile

--- to Carls (thunder8) car. After de-catting his system he found it just too loud and couldn't live with it. Fitted a resonator like the one in the link and it did make a good difference. Don't get me wrong, it won't transform a Nur spec into a Prodrive exhaust note but may well bring it to a level you can live with.

However, the easiest route is to just fit a quieter rear box.

99greenwagon

iTrader: (39)

this is the resonated centre i will be fitting,at the moment i have a brand new straight through centre section.when you look at the resonated bit it makes me think its not going to do **** all? and yes that is also the backbox i have fitted..

99greenwagon

iTrader: (39)

ive also found that some quieter rear boxes tend to be very raspy,and i much prefer the note of the h&s.

MattyB1983

iTrader: (51)

You may well be right mate, that doesn't look like much of a resonator....
Think your either gonna have to -
1..live with it
2..fit a different rear box
3..fit a resonator like the one in my link.

99greenwagon

iTrader: (39)

any suggestions on rear box? something that sounds similar but a little quieter?
dont want much do i?

im worried that the police will not like it as it is?

99greenwagon

iTrader: (39)

if i fit a bigger resonator then it seens to be so low to the ground,it would just get bashed to ****.

99greenwagon

iTrader: (39)

the 3" h&s will be up for sale/swap as ive decided to get a different backbox now.