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      04-04-2019, 04:01 PM   #23
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Quote:
Originally Posted by windtendo View Post
Akra sounds unreal. The titanium gives it a really unique sound!

Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
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      04-04-2019, 07:07 PM   #24
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Quote:
Originally Posted by r33_RGSport View Post
Quote:
Originally Posted by windtendo View Post
Akra sounds unreal. The titanium gives it a really unique sound!

Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
Sorry buddy but I need to correct you on that.

You can bend full Titanium tubes.

There are tubing bending Maschine. Similar to mandrel bending.

It needs to be formed very slow and, if radius is small, tube needs to be heated first. All depending on radius and wall thickness.

I have done it mine self
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      04-04-2019, 09:17 PM   #25
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by r33_RGSport View Post
Quote:
Originally Posted by windtendo View Post
Akra sounds unreal. The titanium gives it a really unique sound!

Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
Sorry buddy but I need to correct you on that.

You can bend full Titanium tubes.

There are tubing bending Maschine. Similar to mandrel bending.

It needs to be formed very slow and, if radius is small, tube needs to be heated first. All depending on radius and wall thickness.

I have done it mine self
It depends on which grade.
When I used to work for Japanese company that do Full Titanium exhaust, we have to do pie cut and weld the pipes to do turn.
And compared to Akra, it is much2 lighter for a similar full system like Akra.
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      04-04-2019, 09:52 PM   #26
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Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5’s stock downpipes."
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      04-04-2019, 10:01 PM   #27
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Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5’s stock downpipes."
If they say so. All good for me.
They do have good product.
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      04-05-2019, 01:31 AM   #28
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How many have just changed the rear silencer only, and left the center pipes alone ?. This seems to be our only option atm in Europe, because of the dreaded opf. Does it make a big difference, just changing the rear silencer ?.
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      04-05-2019, 05:56 AM   #29
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Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5’s stock downpipes."
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
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      04-05-2019, 10:04 AM   #30
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Quote:
Originally Posted by Miko M View Post
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
I have had Akra on my F10 and it didnt turn blue while many other Ti Exhausts Ive had have indeed burned blue. Why is that??
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      04-05-2019, 11:12 AM   #31
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Quote:
Originally Posted by Vic55 View Post
Quote:
Originally Posted by Miko M View Post
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
I have had Akra on my F10 and it didnt turn blue while many other Ti Exhausts Ive had have indeed burned blue. Why is that??
Turning blue you have more stainless steel mixed in
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      04-05-2019, 05:25 PM   #32
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5's stock downpipes."
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
Nicely explained!!
I noticed that you can make cool stuff, I wish I would have your skills.
Is there any other material that is good besides stainless steal and titanium?
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      04-05-2019, 05:35 PM   #33
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Quote:
Originally Posted by M 4EVER View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5's stock downpipes."
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
Nicely explained!!
I noticed that you can make cool stuff, I wish I would have your skills.
Is there any other material that is good besides stainless steal and titanium?
Thank you!

You can use inconel material for exhaust, which is very expensive but it's great for heat and is very corrosion resistant. I would go Inconel 625 for exhaust

I make Springs out of Inconel wire X750 special heat requires over 1000 deg. for 5 hours.

Also Inconel wire is not magnetic at all.

I pretty much use any material that is out there, silver gold and even platinum.
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      04-05-2019, 05:46 PM   #34
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by M 4EVER View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5's stock downpipes."
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
Nicely explained!!
I noticed that you can make cool stuff, I wish I would have your skills.
Is there any other material that is good besides stainless steal and titanium?
Thank you!

You can use inconel material for exhaust, which is very expensive but it's great for heat and is very corrosion resistant. I would go Inconel 625 for exhaust

I make Springs out of Inconel wire X750 special heat requires over 1000 deg. for 5 hours.

Also Inconel wire is not magnetic at all.

I pretty much use any material that is out there, silver gold and even platinum.
Very cool info, appreciate it!!
May I ask for what you use such expensive material for?
I taught you are making tooling and springs?
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      04-05-2019, 06:52 PM   #35
Miko M
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Quote:
Originally Posted by M 4EVER View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by M 4EVER View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by windtendo View Post
Quote:
Originally Posted by r33_RGSport View Post
Sorry, not to crack the beautiful egg.
It is not high grade Titanium.
High grade Titanium can't be bent and exhaust noise will be raspier.
Akrapovic is using stainless mixed Titanium, and charge you a full Titanium price.
Stainless is softer material and make the exhaust noise deeper.
From their own site, it LITERALLY says "Built from high-grade lightweight titanium to reduce weight, with valve housings cast in the in-house foundry, the Evolution Line (Titanium) exhaust system fits directly onto the BMW M5's stock downpipes."
Here are grades off Titanium
Number 1 most pure Titanium

Grade 1-3 mainly get used for Medical application

Grade 4,7,11 grade 4 is good to form used for tubing, heat exchanger

Grade Ti 6AI14V which is grade 5 mainly get used for engine components, aircraft, aerospace

To 6AL-4V ELI grade 23 springs

Grade 12 mainly for heat exchanger

Ti 5AL-2.5Sn Aircraft, airframe
Nicely explained!!
I noticed that you can make cool stuff, I wish I would have your skills.
Is there any other material that is good besides stainless steal and titanium?
Thank you!

You can use inconel material for exhaust, which is very expensive but it's great for heat and is very corrosion resistant. I would go Inconel 625 for exhaust

I make Springs out of Inconel wire X750 special heat requires over 1000 deg. for 5 hours.

Also Inconel wire is not magnetic at all.

I pretty much use any material that is out there, silver gold and even platinum.
Very cool info, appreciate it!!
May I ask for what you use such expensive material for?
I taught you are making tooling and springs?
Yes, I do make Springs but I also make parts for Automotive, DOD, Medical.

Medical parts are what uses very unique materials. Also very small parts... wire diameter that can go below 0.001"
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