Milltek Exhaust

Evotion

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I'd wait until I get my exhaust back from Larini - the Lotus exhaust specialists, as they focus on sound and not just loudness (there is a difference! Few manufacturers actually do this).

I suspect, replacing the second CAT with a sport cat (200 cell) will be the most cost-effective way to get some more sound. Manifold and backbox will 'add' lightness and even more sound with power to boot.
 

KJD

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I suspect, replacing the second CAT with a sport cat (200 cell) will be the most cost-effective way to get some more sound.
Why would you do that?
Getting rid of it altogether would be the easiest and cheapest way to do that.
There are already 3rd cat eliminator pipes available.
 

KJD

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Could this make the car void the warranty?
Technically, yes.
In practice, it would depend what you were trying to claim for under warranty.
Eg: If your suspension falls off then the exhaust is irrelevant.
If your engine blows up, that’s more problematic.
 

Evotion

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Why would you do that?
Getting rid of it altogether would be the easiest and cheapest way to do that.
There are already 3rd cat eliminator pipes available.
I am no expert but perhaps:
Less resonance and perhaps too bassy?
Less sounding like a Fiesta with straight pipes?
Some emission protection (are track days now looking at this?
Less chance of a CEL?
Legality?
Leaner running?

At this stage it is a bit of guest work until people try different things and we get real life data.
Having a completely cat-free system does, at first thought, indeed sound logical.
 

kitkat

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I am no expert but perhaps:
Less resonance and perhaps too bassy?
Less sounding like a Fiesta with straight pipes?
Some emission protection (are track days now looking at this?
Less chance of a CEL?
Legality?
Leaner running?

At this stage it is a bit of guest work until people try different things and we get real life data.
Having a completely cat-free system does, at first thought, indeed sound logical.
Replacing the secondary cat still leaves the primary cats in place.
 

KJD

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I am no expert but perhaps:
Less resonance and perhaps too bassy?
Less sounding like a Fiesta with straight pipes?
Some emission protection (are track days now looking at this?
Less chance of a CEL?
Legality?
Leaner running?

At this stage it is a bit of guest work until people try different things and we get real life data.
Having a completely cat-free system does, at first thought, indeed sound logical.
Not cat free. That’s not what I mean.

Remove the 3rd cat between the downpipes and the silencer but leave the two cats in the manifolds.
Plenty of info about this out there (including a thread on here - https://www.emiraforum.com/threads/3rd-cat-delete.2326/ )

Standard practice in Evoras that had the 3rd cat (US market).

Better sound but not hugely different.
Emissions are fine (non-US Evoras didn’t have the 3rd cat).
Pretty sure track days only worry about noise, not emissions.
There was no CEL in Evoras. There are no O2 sensors around the 3rd cat.
Perfectly legal, as emissions are still legal (maybe not in certain US states).
There was no issue with lean running in Evoras.

The system in the Emira looks almost identical to the Evora apart from a slightly different silencer layout. You would logically expect the Emira to accept the 3rd cat delete in the same way.
 

Evotion

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Cool then.

Larini will give me a full report on this, and all the options, so will be sharing that.
Once underneath the car, he did say it looked similar to the others he has worked on, though the tiwn box is of course split wide. Seems to be going okay, not heard of any fitting problems.

I have asked them to do a sound check with all the different options fitted but they will likely forget.
 
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kitkat

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If Larini’s Emira setup is anything like their Evora setup, their system modifies emissions way more than this milltek. From what I can see on their website:
- Both headers are replaced
- All three cats are replaced
- A single high flow cat is placed where the third cat is
- Both oxygen sensors are extended and plugged into the single cat
- No resonator
- Basically every single part of the exhaust system is replaced
- This is probably way louder
- All the concerns @Evotion has about the exhaust are far more applicable to Larini
 

Evotion

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Yeah, that sounds about right!
That is the whole system though.,
We are trying to guess what difference removing one Cat does so people can get the best bang for their buck.

I doubt many people will go for a full flowing system. Larini will offer one, Akra might do, but it would be VERY expensive.
 

Emira28

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Larini Sports Cat and Exhaust back-box have been the best mods on our Elise and Exige. Interested to see what they do for the Emira.
 

Porter

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$10k?? The idea of paying a price that high for such a short exhaust system seems wild to me. It's 1/3 the size of the system for a front engine car. Design is certainly worth something, but after that it's just some welded steel tubes.

My car's money is on a 1-to-2 Magnaflow with a resonator in the 3rd cat location, welded up with a well-planned set of Burns Stainless pre-bent tubing.

The configuration on the Emira isn't unusual. Here's an exhaust for a 1998 Chevrolet Camaro, for example. Look familiar?
Screenshot_20230319-092655.png


Here's the muffler section for this, specified for the full flow of a 5.8L V8.
ZZ2_12_e5d4fa3e-2910-4cfc-bdb6-eb4999be6de5_1500x.jpg


This whole system is like $700 retail. Cut the tubes in a few spots and clock the angles, tab on some hangers and you have a complete Emira post-cat system.
 
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KJD

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$10k?? The idea of paying a price that high for such a short exhaust system seems wild to me. It's 1/3 the size of the system for a front engine car. Design is certainly worth something, but after that it's just some welded steel tubes.

My car's money is on a 1-to-2 Magnaflow with a resonator in the 3rd cat location, welded up with a well-planned set of Burns Stainless pre-bent tubing.

The configuration on the Emira isn't unusual. Here's an exhaust for a 1998 Chevrolet Camaro, for example. Look familiar?
View attachment 23999

Here's the muffler section for this, specified for the full flow of a 5.8L V8.
View attachment 24000

This whole system is like $700 retail. Cut the tubes in a few spots and clock the angles, tab on some hangers and you have a complete Emira post-cat system.
I’m not saying it’s worth 10k but have you seen an Akrapovic? Beautiful workmanship.
And fully titanium. No cheap heavy steel.
My guesstimate is for a full system, nose to tail.

Would I pay £10k for one? No.
But if it was £5-6k? I’d be tempted…
 

Porter

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I’m not saying it’s worth 10k but have you seen an Akrapovic? Beautiful workmanship.
And fully titanium. No cheap heavy steel.
My guesstimate is for a full system, nose to tail.

Would I pay £10k for one? No.
But if it was £5-6k? I’d be tempted…
I mean a bike exhaust from them is what, $1k? And this is the size of maybe 2 of those? In the end it's just tubes and welds. $2k or even $3k for a full titanium well designed exhaust seems in the realm of "premium reasonable" for an exhaust of this size and complexity. But $5k to $10k? It would need to include full tubular headers and high flow cats and the whole enchilada.
 

KJD

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As I said, I’m talking about nose to tail, the whole enchilada.

For comparison they do a system for my other car, a Porker Macan GTS.
Mid pipes and two silencers. £7k.
That’s informing my guess.
Quality, but proper quality ain’t cheap.

1679251597020.jpeg

View attachment 24009View attachment 24009
 

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