Track day Exhaust for low boost 6 - Exhausts Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Track day Exhaust for low boost 6

simonmanchester

Newbie

Location: Nottingham

Registered: 27 Apr 2017

Posts: 16

Status: Offline

Post #1

Hi everyone,

First post here. I've been to a track day today at donnington in my low boost supercharged gti6. Unfortunately i hadn't had my car noise tested as it's not road legal, so took it on the off chance, but it failed the drive by noise limits. I didn't have a static test though. 2 readings, one was 101dba and the 2nd was 103dba. Track day organisers were unhelpful and wouldn't disclose the location of the mic's and wasnt allowed back on. A waste of £240 :-/

Anyone got any idea what sort of exhaust system i could get that would be supercharger friendly but also below 98dba?

Simon

________________________________________

Simon

Posted 27th Apr 2017 at 18:26

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superchargedblack1997gti6

Seasoned Pro

Location: guildford

Registered: 15 Aug 2009

Posts: 2,376

Status: Offline

Post #2

Get a 3 inch system and a box that goes the whole length of the car that's what I've done? Someone said they used a jetex exhaust and said it was quiet.

________________________________________

Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 27th Apr 2017 at 18:34

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #3

what have you got on there now?

i doubt you need 3" on low boost, they're only 240-250 bhp, 2.5" works fine, something like Magnex will be quiet enough if in good condition, AdamB has been on Combe with his. (we did re-pack the middle box)

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 27th Apr 2017 at 18:43

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superchargedblack1997gti6

Seasoned Pro

Location: guildford

Registered: 15 Aug 2009

Posts: 2,376

Status: Offline

Post #4

I bet he's got magnex Mei

________________________________________

Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 27th Apr 2017 at 18:43

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #5

I'm running 240 ish n-a through a Milltek and the intake is much louder, though no idea on the Db levels.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 27th Apr 2017 at 18:44

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #6

superchargedblack1997gti6 wrote:

I bet he's got magnex Mei

probably needs cutting open and re-packing like most then, or fitting new boxes.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 27th Apr 2017 at 18:45

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simonmanchester

Newbie

Location: Nottingham

Registered: 27 Apr 2017

Posts: 16

Status: Offline

Post #7

Thanks guys. I know i need to do something, was gutted to be turfed off after driving the 6 properly for the first time since it was finished being built.

Not sure what system i have now as it was already on the car when i brought it, but it has a oval outlet on the back box. It has a Decat but still has the center box, however i think it might be a custom system as there is no joins anywhere.

Is there much room underneath to get bigger boxes fitted? I also think magnex would be louder than mine (pretty sure my brother in law's 6 has magnex backbox and it's loud as f**k).

________________________________________

Simon

Posted 27th Apr 2017 at 19:08

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #8

loads of room if you put the rear box across the boot floor.

magnex shouldnt be that loud but they are all really old now and werent particularly expensive units new, most I have seen recently have needed at least the middle box repacking.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 27th Apr 2017 at 20:10

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3rd time lucky

Seasoned Pro

Location: maidstone

Registered: 23 Apr 2007

Posts: 1,878

Status: Offline

Post #9

Find an exhaust fabricator. They will do what you want. I got a cat-back system built for my low boost with 'track use' in mind. So he built 2.5" all the way through including the tip as he said a larger tip could have a trumpet effect. I'm yet to get it tested but he assured me it will be good for track use.

________________________________________

DIABLO GTI-6 - Legend - NILE GTI-6 - Sold
CHERRY GTI-6 P1 SUPERCHARGED - Broken up
BLACK RALLYE - Sold
205 Dturbo xud9 work horse - Dead
CHERRY RALLYE - new toy

Posted 27th Apr 2017 at 20:20

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RallyeRed

Regular

Location: Northwich

Registered: 03 May 2016

Posts: 353

Status: Offline

Post #10

For off the peg go Jetex. Magnex are much louder and boomy.
Is there a chance intake noise was triggering it rather than exhaust noise?

Posted 27th Apr 2017 at 22:23

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cully

Seasoned Pro

Location: Cullompton

Registered: 12 Jun 2013

Posts: 1,093

Status: Offline

Post #11

just had my system repacked both box's as it was 102db at combe

back down to 96 now but still not low enough for my liking

Posted 28th Apr 2017 at 11:00

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simonmanchester

Newbie

Location: Nottingham

Registered: 27 Apr 2017

Posts: 16

Status: Offline

Post #12

It could be intake noise too, it screams at full chat. Anything I can do about the intake noise? It has a round k&n type filter on the end of the inlet so it's definitely a source for most of its noise.

As for the exhaust, would using the spare wheel space underneath for a large box be the way to go?

________________________________________

Simon

Posted 28th Apr 2017 at 19:36

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adam b

Seasoned Pro

Location: The Nam

Registered: 24 Jan 2006

Posts: 12,828

Status: Offline

Post #13

So mine is a group N skid plated old magnex 2.25" two boxes with a decat.

Static at combe was 89db at 4750rpm. Not sure they used a driveby that day, but it's not overly loud.
Jetex and blueflame are supposed to be good for noise, there are a variety of magnex, most are loud. Yours sounds strange as I've only ever seen a longlife be one whole piece, two boxes, oval tip but it was very loud

________________________________________

Nothing to see here

Posted 28th Apr 2017 at 22:33

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adam b

Seasoned Pro

Location: The Nam

Registered: 24 Jan 2006

Posts: 12,828

Status: Offline

Post #14

Agree on the screaming too, was thinking about doing similar but I like it too much!

________________________________________

Nothing to see here

Posted 28th Apr 2017 at 22:35

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RallyeRed

Regular

Location: Northwich

Registered: 03 May 2016

Posts: 353

Status: Offline

Post #15

simonmanchester wrote:

Pretty sure a k&n won't send you over the noise limit.

Posted 29th Apr 2017 at 09:18

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #16

it might as its clamped to a Supercharger...

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 29th Apr 2017 at 10:31

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3rd time lucky

Seasoned Pro

Location: maidstone

Registered: 23 Apr 2007

Posts: 1,878

Status: Offline

Post #17

My intake is nowhere near as loud as my exhaust! I wouldn't even consider it to be an issue tbh.

________________________________________

DIABLO GTI-6 - Legend - NILE GTI-6 - Sold
CHERRY GTI-6 P1 SUPERCHARGED - Broken up
BLACK RALLYE - Sold
205 Dturbo xud9 work horse - Dead
CHERRY RALLYE - new toy

Posted 29th Apr 2017 at 13:03

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #18

oh, fair enough, mine is LOL

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 29th Apr 2017 at 13:20

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3rd time lucky

Seasoned Pro

Location: maidstone

Registered: 23 Apr 2007

Posts: 1,878

Status: Offline

Post #19

welshpug! wrote:

oh, fair enough, mine is LOL

Got any vids?

________________________________________

DIABLO GTI-6 - Legend - NILE GTI-6 - Sold
CHERRY GTI-6 P1 SUPERCHARGED - Broken up
BLACK RALLYE - Sold
205 Dturbo xud9 work horse - Dead
CHERRY RALLYE - new toy

Posted 29th Apr 2017 at 13:52

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blandy

Seasoned Pro

Location: Bucks

Registered: 25 Feb 2007

Posts: 2,437

Status: Offline

Post #20

From when mine was charged I couldn't ever see the intake being loud enough to cause any issues with noise levels as wouldn't say it was much louder than stock intake wise.

Posted 29th Apr 2017 at 16:40

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Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,209

Status: Offline

Post #21

As others have said ...it won't be intake DBs Thumbs down

.....
It will be your first box under the handbrake needs cutting open & repacking again ...it burns & blows out of that box & all it needs is that ....get the tailpipe box looked at also ..

I'm not Charged ...but my full on race engine after exhaust repacking only omits 89dbs at 4500 rpm & is Stainless that seems to have a different tinnier sound Whistle

Posted 29th Apr 2017 at 17:11

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fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

Status: Offline

Post #22

Buy a couple of flowmaster chamber boxes.will sort you out no bother

________________________________________

Posted 29th Apr 2017 at 23:32

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simonmanchester

Newbie

Location: Nottingham

Registered: 27 Apr 2017

Posts: 16

Status: Offline

Post #23

Right. Exhaust is off, it's a longlife cat back system. Do you think repacking the midbox and backbox with acoustafil will lower the noise enough? Or should I bite the bullet and get another system?

Is anyone willing to swap a longlife for a jetex? ;-)

________________________________________

Simon

Posted 2nd May 2017 at 15:49

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #24

its worth a go if the boxes are a reasonable size, not seen how the longlife are packed but the Magnex has a layer of steel wool around the perforated tube then glass pack for the rest.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 2nd May 2017 at 15:55

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Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,209

Status: Offline

Post #25

simonmanchester wrote:

It worked on mine & unless you got a money tree in your garden what have you got to lose Whistle

Posted 2nd May 2017 at 16:11

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