What exhaust back box is on your CSL?

**shimmy** · 26-11-2009, 11:21 PM

Interested to know how many have a/m back boxes and what they are.

DuncanR · 27-11-2009, 09:45 AM

After track day at Bedford last Saturday where I got pulled for ALMOST pinging the sound monitor at end of back straight, I would be loathe to put anything else on it, as it would appear that the options make it sound better, but i dont know if sound better also means louder...comments please ? After returning to pits and being checked I was allowed out again.
For info my reading at the stationary check was 80dB taken @ 4500 rpm.

_Nathan_ · 27-11-2009, 09:52 AM

I've been black flagged and sent home twice from bedford with a standard exhaust, depending on atmospheric conditions the induction and set off the meters so it may have been that?

mattCSLnut · 27-11-2009, 10:00 AM

Quote:

Originally Posted by DuncanR

After track day at Bedford last Saturday where I got pulled for ALMOST pinging the sound monitor at end of back straight, I would be loathe to put anything else on it, as it would appear that the options make it sound better, but i dont know if sound better also means louder...comments please ? After returning to pits and being checked I was allowed out again.
For info my reading at the stationary check was 80dB taken @ 4500 rpm.

At Brands yesterday, my CSL's reading @ 70% RPM (5500 RPM) was 89 dB. That's with a standard O.E. CSL back box (different to a regular E46 M3 back box) but the Supersprint 100 cell cats + Stainless Steel mid section must have been liberating some of the sound. It's still very purposeful in action but relaxing and quiet on motorways and I can enjoy the induction noise more

I wonder what would have been if I left the light weight MK2 MILLTEK back box on ?!?!

IMHO, the louder the better is a "No! No!" ... my MILLTEK is proof of that.

**AlexGTT** · 27-11-2009, 11:16 AM

They are idiots at Bedford sometimes! I had a couple of days without issue but on one occasion last year I was told by the noise tester as I arrived that I'd better cruise round because "these things" (CSL's) have exhausts that are too loud! I told him it was a standard car, no mods and the noise is induction. He basically dismissed me as a liar and told me my exhaust has a flap that opens up by-passing the silencer. I gave up at this point.

It wasn't a shock when I was black flagged twice and kicked off in the afternoon.

mattCSLnut · 27-11-2009, 11:31 AM

Quote:

Originally Posted by AlexGTT

They are idiots at Bedford sometimes! I had a couple of days without issue but on one occasion last year I was told by the noise tester as I arrived that I'd better cruise round because "these things" (CSL's) have exhausts that are too loud! I told him it was a standard car, no mods and the noise is induction. He basically dismissed me as a liar and told me my exhaust has a flap that opens up by-passing the silencer. I gave up at this point.

It wasn't a shock when I was black flagged twice and kicked off in the afternoon.

Unbelievable Mupperty

. Surely they noise tested your exhaust's dB before letting you out ? Once that's done and within limits, they should leave U alone, induction noise or not. THANX for the warning

as I am contemplating a visit there at the end of Jan 2010 for a mate's Birthday bash.

mattCSLnut · 27-11-2009, 11:41 AM

Quote:

Originally Posted by _Nathan_

I've been black flagged and sent home twice from bedford with a standard exhaust, depending on atmospheric conditions the induction and set off the meters so it may have been that?

Sounds like Bedford is "CSL unfriendly" + I think their dB noise limits are quite low to begin with anyway. Brands Hatch yesterday was very CSL friendly @ 105dB

**AlexGTT** · 27-11-2009, 12:50 PM

Quote:

Originally Posted by mattCSLnut

Unbelievable Mupperty

. Surely they noise tested your exhaust's dB before letting you out ? Once that's done and within limits, they should leave U alone, induction noise or not. THANX for the warning

as I am contemplating a visit there at the end of Jan 2010 for a mate's Birthday bash.

Yes, static test was fine but they have a drive by meter on one of the straights and will black flag you if that is tripped.

DuncanR · 27-11-2009, 03:35 PM

The problem they have at Bedford is that the noise monitoring forms part of the planning permission, and as such, the monitors have a direct link to the Council Offices, and if they see that one of the monitors has been pinged they come out to the track and the track have to have a very good reason why it was pinged !! I would say that giving a CSL the beans down the back straight is a very good reason indeed !!!

mattCSLnut · 27-11-2009, 04:03 PM

Quote:

Originally Posted by AlexGTT

Yes, static test was fine but they have a drive by meter on one of the straights and will black flag you if that is tripped.

Bastards

View Poll Results: What Exhaust Back Box Do You Have??
OEM BMW	21	52.50%
Supersprint Lightweight (one box)	1	2.50%
Supersprint Lightweight RACE (two boxes)	7	17.50%
Milltek	3	7.50%
Other	8	20.00%
Voters: 40. You may not vote on this poll

26-11-2009, 11:21 PM	#1
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	What exhaust back box is on your CSL? Interested to know how many have a/m back boxes and what they are.

27-11-2009, 11:16 AM	#5
AlexGTT CSL Register Uber-poster! Join Date: Apr 2008 Location: Herefordshire Posts: 4,374 Casino cash: $8572	They are idiots at Bedford sometimes! I had a couple of days without issue but on one occasion last year I was told by the noise tester as I arrived that I'd better cruise round because "these things" (CSL's) have exhausts that are too loud! I told him it was a standard car, no mods and the noise is induction. He basically dismissed me as a liar and told me my exhaust has a flap that opens up by-passing the silencer. I gave up at this point. It wasn't a shock when I was black flagged twice and kicked off in the afternoon. __________________ CSL Register Alcoholics Anonymous Group Leader & Businessman of the Year '93! www.earleyengineering.com

27-11-2009, 09:45 AM	#2
DuncanR CSL Register Uber-poster! Join Date: Sep 2009 Location: Olney, Bucks Posts: 3,735 Casino cash: $9994	After track day at Bedford last Saturday where I got pulled for ALMOST pinging the sound monitor at end of back straight, I would be loathe to put anything else on it, as it would appear that the options make it sound better, but i dont know if sound better also means louder...comments please ? After returning to pits and being checked I was allowed out again. For info my reading at the stationary check was 80dB taken @ 4500 rpm.

27-11-2009, 09:52 AM	#3
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	I've been black flagged and sent home twice from bedford with a standard exhaust, depending on atmospheric conditions the induction and set off the meters so it may have been that?

27-11-2009, 03:35 PM	#9
DuncanR CSL Register Uber-poster! Join Date: Sep 2009 Location: Olney, Bucks Posts: 3,735 Casino cash: $9994	The problem they have at Bedford is that the noise monitoring forms part of the planning permission, and as such, the monitors have a direct link to the Council Offices, and if they see that one of the monitors has been pinged they come out to the track and the track have to have a very good reason why it was pinged !! I would say that giving a CSL the beans down the back straight is a very good reason indeed !!!