SM Exhaust

BennyD

BennyD

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I think they must be Phil! Best to listen with headphones; with valves open there is more bass and more crackles. In use even with valves open it is fairly restrained up to 4k and then they really sing. Very much like my 'Le Mans' spec but not as harsh. I'm hopefully fitting the vacuum kit later this week so I'll have operational valves so I can venture into town centres without giving oaps heart failure. More importantly, there doesn't seem to be any resonance between 1800 and 4000 rpm. It could be the answer for those with coupes that want more sound without the 'boom' and want to keep the standard look.
 
BennyD

BennyD

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rossyl said:
A bit louder with them open with more pops and crackles. But to be honest it does not sound like there is a huge difference.

I listened with some earbud headphones. A WARNING to anyone else who does this, it gets a **** of a lot louder right at the end of the videos.

I'm just off to put some cotton buds in my bleeding ears. ;)
Click to expand...

In real life there is quite a difference, it's just that the mic on an I-pad isn't that great and tends to get a bit maxed out when assaulted in such a way!
 
Hexadex

Hexadex

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Chrisbassett said:
Just bumping this up. I'm interested in getting the x-pipe that Matt has prototyped, but we need three or four more takers to place an order at the price quoted (£240 inc vat & delivery).

Go on, you know you want to!
Click to expand...

Hi Chris I'm certainly interested
 
VMSRTI

VMSRTI

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Is this simply modified gs boxes with no other changes to the exhaust? Or are there other mods as well?
What mods have been done to the boxes?

Conaero said:
Here are 2 vids that Ian has asked me to put up:

Valves OPEN:

[video=youtube_share;vjeiOs5S360]http://youtu.be/vjeiOs5S360[/video]


Valves CLOSED:

[video=youtube_share;04vaoY5VygM]http://youtu.be/04vaoY5VygM[/video]
Click to expand...
 
BennyD

BennyD

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VMSRTI said:
Is this simply modified gs boxes with no other changes to the exhaust? Or are there other mods as well?
What mods have been done to the boxes?
Click to expand...

This system spec is as follows; Larini sports cats, SM straight through centre and modified GS boxes. The rear boxes were completely gutted and re-piped. The pipe between the inlet and the loud side now has solid pipe (originally perforated) with a perforated pipe coming off to the 'quiet' side. I will find out how effective the 'quiet' side is later this week when I fit the vacuum system that operates the valves. It's a work in progress.
 
BennyD

BennyD

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Valves now operational and they work very well. My only tinge of regret was that they wouldn't open automatically when in sport so imagine my surprise when I found they do open automatically from 3500 rpm upwards because of exhaust gas pressure pushing on the butterfly valve. They close again too when you close the throttle. So now I can toddle around in stealth mode and still unleash the beast when I floor it. However, the valves will always be open unless I'm being followed by police, trying to get on the Nurburgring or trying to sneak off for an early morning blast with the boys. Result!
 
H

Hedgetrimmer

Junior Member
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145
Just reading through the thread and getting lost in all of the discussions. I have been wanting to do both mods after having the Larini manifolds and sports cats fitted as the GS is still a little muted. Couple of questions:

Has the x pipe and GS modification now been fully developed and what are the final prices?
What is the turn around time as my car will be off the road whilst the boxes are away?
Is it necessary to remove the rear bumper to fit the boxes?

Cheers, Carl
 
BennyD

BennyD

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Carl, still going through road testing at the moment but we should have a better idea of final costs and turn around times in the next 2-3 weeks. I am away a lot at the moment so my opportunities for thrashing it are a little scarce at the moment; I was going to do a fair bit of driving over the weekend but I am now going to be in Cancun. Watch this space.

No, you don't have to take the rear bumper off to change the rear boxes.
 
conaero

conaero

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34,672
As Benny says. We are not a profit making outfit so we dont have the funds to purchase sets of them and keep them in stock.

What will probably happen is we will do a group buy and where you will need to supply your own set of GS boxes for modification plus the option to buy the X pipe.
 
Hexadex

Hexadex

Member
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827
Conaero said:
As Benny says. We are not a profit making outfit so we dont have the funds to purchase sets of them and keep them in stock.

What will probably happen is we will do a group buy and where you will need to supply your own set of GS boxes for modification plus the option to buy the X pipe.
Click to expand...

Hi Conaero,
Just wondering if there's any news on the exhaust systems price yet?
 
VEDE

VEDE

Junior Member
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167
BennyD said:
This system spec is as follows; Larini sports cats, SM straight through centre and modified GS boxes. The rear boxes were completely gutted and re-piped. The pipe between the inlet and the loud side now has solid pipe (originally perforated) with a perforated pipe coming off to the 'quiet' side. I will find out how effective the 'quiet' side is later this week when I fit the vacuum system that operates the valves. It's a work in progress.
Click to expand...

Benny, Do you have any photos of the mods you did to the GS boxes?

If I was going to go down that path I'd do it locally here in OZ to make it worth the cost.
 
BennyD

BennyD

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Just to bump this thread. Matt and I have fitted his car with unsilenced X-pipe and modified GS rear boxes. A full description with video will be posted very soon. Watch this space as it may appeal to those who want more volume without splitting their ears.
 
S

SimonCC

New Member
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690
BennyD said:
Just to bump this thread. Matt and I have fitted his car with unsilenced X-pipe and modified GS rear boxes. A full description with video will be posted very soon. Watch this space as it may appeal to those who want more volume without splitting their ears.
Click to expand...

Looking forward to seeing that Benny!
 
BennyD

BennyD

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Even with standard cats it makes quite a difference. It also gives you the option to upgrade to sports cats if you want even more sound.
 
BennyD

BennyD

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That's what I have got on mine but you can get the cat cans opened and 200 cell cats fitted in place of the 600 and 400 cell standard cats. That makes quite a difference to gas flow and volume levels when changing at least one other section of exhaust (centre box and/or rear boxes).
 
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