CSL exhaust "Rasp" ??

Windowlicker · 27-01-2009, 07:41 PM

Hi there,

Question is, which part of th eexhaust system is it that generates the raspy metallic noise
/ Is it the centre section, the backbox?
I like the noise, sounds quite rude,

but would replacing the offending section with an aftermarket item, Miltek for example, retain the charcteristic noise but change it to a deeper sound, rather than being so tinny?
Thank ya, in advance.

SMD · 27-01-2009, 07:59 PM

I think the Rasp is from the Backbox!

The rattle is from the Cats!

s.mac · 27-01-2009, 08:35 PM

Can only comment on experience in my M3, i had a supersprint lightweight back box and the rasp went, sounded great when giving it some but did my head in when not, deep boom at mid range, put an x pipe on and no improvement although there is an x pipe with resonator so that might of got the rasp back.

**Andyk** · 27-01-2009, 08:38 PM

Quote:

Originally Posted by SMD

The rattle is from the Cats!

Is that what I get when car is cold.

Windowlicker · 27-01-2009, 08:59 PM

Quote:

Originally Posted by Andyk

Quote:

Originally Posted by SMD

The rattle is from the Cats!

Is that what I get when car is cold.

Mine is the same when cold, lift off and it rattles and also you get dull thudding noises, sounds a bit like backfires, just the wadding/internals moving back and forth i guess, until it expands with the heat , then it stops.

Has anyone fitted just a miltek backbox? if so did it keep or loose the rasp?
Cheers

dave1 · 27-01-2009, 09:02 PM

ask glendog to confirm but i think the milltek loses the rasp

**Andyk** · 27-01-2009, 09:04 PM

Quote:

Originally Posted by Windowlicker

Quote:

Originally Posted by Andyk

Quote:

Originally Posted by SMD

The rattle is from the Cats!

Is that what I get when car is cold.

Mine is the same when cold, lift off and it rattles and also you get dull thudding noises, sounds a bit like backfires, just the wadding/internals moving back and forth i guess, until it expands with the heat , then it stops.

Cheers

Yep thats the noise, get that as well...

**glendog74** · 27-01-2009, 10:09 PM

Quote:

Originally Posted by Windowlicker

Has anyone fitted just a miltek backbox? if so did it keep or loose the rasp?

I have a full Miltek system and the there is no rasp anymore but instead a deeper, dare i say 'meatier' tone. I like it but at times do miss the rasp.

As already said, It is the backbox that causes the rasp i believe. When i had the 100cell cats fitted, it simply added a din at certain revs noisewise!

I would love to have a Supersprint or Gruppe M fitted but they are just that little bit too much for everyday driving and carrying the missus around!

E46ACS · 27-01-2009, 10:13 PM

I have been thiking about an exhaust, but want to hear others before I decide.

**glendog74** · 27-01-2009, 10:13 PM

I also had a really bad rattle when i had the 100cell cat fitted - i think it was the two cat sections touching or maybe resonating against the exhaust/transmission tunnel. It lessened when warm but never completely went away

27-01-2009, 07:41 PM	#1
Windowlicker S4 - Getting the hang of it Join Date: Dec 2008 Location: York Posts: 174 Casino cash: $544	CSL exhaust "Rasp" ?? Hi there, Question is, which part of th eexhaust system is it that generates the raspy metallic noise / Is it the centre section, the backbox? I like the noise, sounds quite rude, but would replacing the offending section with an aftermarket item, Miltek for example, retain the charcteristic noise but change it to a deeper sound, rather than being so tinny? Thank ya, in advance. __________________ Procrastination is the thief of time!!

27-01-2009, 10:13 PM	#9
E46ACS S5, Sport Off, DSC M-track Join Date: Oct 2008 Location: Durham Posts: 771 Casino cash: $1950	I have been thiking about an exhaust, but want to hear others before I decide. __________________ "Brake.....brake......SUPER BRAKE!!!"

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27-01-2009, 07:59 PM	#2
SMD S6, Sport On, Traction Off Join Date: Jun 2008 Location: Shropshire Posts: 1,505 Casino cash: $10726	I think the Rasp is from the Backbox! The rattle is from the Cats!

27-01-2009, 08:35 PM	#3
s.mac CSL Register Uber-poster! Join Date: Jun 2008 Posts: 4,247 Casino cash: $15600	Can only comment on experience in my M3, i had a supersprint lightweight back box and the rasp went, sounded great when giving it some but did my head in when not, deep boom at mid range, put an x pipe on and no improvement although there is an x pipe with resonator so that might of got the rasp back.

27-01-2009, 09:02 PM	#6
dave1 S5, Sport Off, DSC M-track Join Date: Sep 2008 Location: CORNWALL Posts: 937 Casino cash: $1432	ask glendog to confirm but i think the milltek loses the rasp

27-01-2009, 10:13 PM	#10
glendog74 CSL Register Uber-poster! Tetris Champion! Join Date: Apr 2008 Location: Cornwall Posts: 8,861 Casino cash: $32299	I also had a really bad rattle when i had the 100cell cat fitted - i think it was the two cat sections touching or maybe resonating against the exhaust/transmission tunnel. It lessened when warm but never completely went away