Akrapovic X-Pipe Advise

[ian27]

First time poster, long time reader. Hope to get some insightful opinions/suggestions!

Just got my hands on an 2009 E92 M3 & would like to get some opinions on exhaust setup. Car came with an Akrapovic slip-on muffler and stock midpipes.

Looking to get more sound from the exhaust, so looking at options to do a full decat (primary & secondary) as well as a resonator delete similar to the GT4 system, but in stainless steel. Not sure how the sound would be like combining stainless steel mid pipes to a titanium akra muffler. Has anyone done this & have clips of it? I want to maintain that deep bassy and howling sound which I currently have, but would also like to experience a little of that raspy-ness and exotic sound from the S65. My concerns are the smell as this is my daily driver.

Would adding HFC (100/ 200 cell) or 2 resonators be a better bet in terms of reducing the smell? I also plan on doing a tune, where I've read HFC gives more hp. Will I be loosing out on a significant power gain with a full catless setup as compared to one with HFC or resonators? Mainly looking to gain extra torque which I feel this car needs!

*The exhaust will be done at my local exhaust shop, so it's pretty customisable and not stuck with pre-built/ designed ones by vendors

Would love to hear your suggestions & thoughts!

Thanks in advance

[Rochen_00]

I spent a season with a completely decat xpipe, and I can assure you that it smells of smoke. For me, the ideal would be a decat but only with some 100 cell HFCs.

In terms of sound, the combination of stainless steel with titanium I have no idea how it could sound

Right now I have a complete akrapovic evo line

[Blindside_137]

There are a lot of videos on YouTube.

My Akrapovic slip on is getting installed this week and I plan to eventually add HFC x pipe down the road. I know I never want catless (minimal performance gain over HFC compared to the smell you now deal with)

A catless and resonatorless stainless steel setup is like a GT4 on steroids. Here are a few on YouTube.

These are resonated catless setups which I think sound perfect (but I don't want the smell). The macht Schnell video does have a supercharger.

Then here is a HFC setup to help with smell, still would need tune for CEL as primaries are deleted and the HFC is in secondary location. I do think the stainless x pipes add more volume over a titanium piece. I think the challenge sport x pipe videos below are louder than evolution videos (although they are identical x pipes with primary decat, HFC secondary, and resonators just stainless vs titanium)

I think a perfect solution may be primary decat and HFC secondary like the EVO and challenge sport x pipe, but to delete the resonator. This may get you a tiny bit more volume on par with the catless setups but not the smell. As far as I know there is no x pipe on the market that is HFC and resonatorlesss. It would have to be custom.

[tbuck]

No resonator = drone city.

[ian27]

Originally Posted by Rochen_00

I spent a season with a completely decat xpipe, and I can assure you that it smells of smoke. For me, the ideal would be a decat but only with some 100 cell HFCs.

In terms of sound, the combination of stainless steel with titanium I have no idea how it could sound

Right now I have a complete akrapovic evo line

Hey man! Appreciate the response. Do 100 cell cats vs 200 cell cats make much of a difference in terms of sound and power? Which would make more power and which would make more sound? Also, would you happen to know if the highflow cats in the Akra Evo line are 100 or 200 cell?

Thank you in advance

[ian27]

Originally Posted by Blindside_137

There are a lot of videos on YouTube.

My Akrapovic slip on is getting installed this week and I plan to eventually add HFC x pipe down the road. I know I never want catless (minimal performance gain over HFC compared to the smell you now deal with)

A catless and resonatorless stainless steel setup is like a GT4 on steroids. Here are a few on YouTube.

These are resonated catless setups which I think sound perfect (but I don't want the smell). The macht Schnell video does have a supercharger.

Then here is a HFC setup to help with smell, still would need tune for CEL as primaries are deleted and the HFC is in secondary location. I do think the stainless x pipes add more volume over a titanium piece. I think the challenge sport x pipe videos below are louder than evolution videos (although they are identical x pipes with primary decat, HFC secondary, and resonators just stainless vs titanium)

I think a perfect solution may be primary decat and HFC secondary like the EVO and challenge sport x pipe, but to delete the resonator. This may get you a tiny bit more volume on par with the catless setups but not the smell. As far as I know there is no x pipe on the market that is HFC and resonatorlesss. It would have to be custom.

Hey dude, thank you for your response and opinions! Really hepful. Do share some clips of yours when you have it installed! Same question as above, would you know if 100 cell cats vs 200 cell cats have a huge difference in terms of power and sound?

But yup, will definitely require a custom fabrication. Just thinking whether or not to go with 100 cell or 200 cell. Defo no resonators for me

[Rochen_00]

Originally Posted by ian27

Hey man! Appreciate the response. Do 100 cell cats vs 200 cell cats make much of a difference in terms of sound and power? Which would make more power and which would make more sound? Also, would you happen to know if the highflow cats in the Akra Evo line are 100 or 200 cell?

Thank you in advance

I honestly don't think it's a big difference in terms of power. Obviously, the less restrictive the xpipe is, the more sound.
The akra evo install 100HFC

[Longboarder]

Originally Posted by ian27

First time poster, long time reader. Hope to get some insightful opinions/suggestions!

Just got my hands on an 2009 E92 M3 & would like to get some opinions on exhaust setup. Car came with an Akrapovic slip-on muffler and stock midpipes.

Looking to get more sound from the exhaust, so looking at options to do a full decat (primary & secondary) as well as a resonator delete similar to the GT4 system, but in stainless steel. Not sure how the sound would be like combining stainless steel mid pipes to a titanium akra muffler. Has anyone done this & have clips of it? I want to maintain that deep bassy and howling sound which I currently have, but would also like to experience a little of that raspy-ness and exotic sound from the S65. My concerns are the smell as this is my daily driver.

Would adding HFC (100/ 200 cell) or 2 resonators be a better bet in terms of reducing the smell? I also plan on doing a tune, where I've read HFC gives more hp. Will I be loosing out on a significant power gain with a full catless setup as compared to one with HFC or resonators? Mainly looking to gain extra torque which I feel this car needs!

*The exhaust will be done at my local exhaust shop, so it's pretty customisable and not stuck with pre-built/ designed ones by vendors

Would love to hear your suggestions & thoughts!

Thanks in advance

Which X pipe did you go with?

By the way is there any rasp with your current set up stock X pipe with Akra cat back?

[ian27]

Originally Posted by Longboarder

Which X pipe did you go with?

By the way is there any rasp with your current set up stock X pipe with Akra cat back?

I have not pulled the trigger on any X pipe yet. Still conducting some research!

No rasp with the current stock x pipe and Akra muffler.

[dsu*]

Do you guys have any drone with Akra slip on and aftermarket midpipe? Or Akra full evo? Buddy of mine has Akra Evo and said the drone between 2500-4000 rpm is pretty serious, feels like the whole car is buzzing.

[amrazM]

Originally Posted by dsu*

Do you guys have any drone with Akra slip on and aftermarket midpipe? Or Akra full evo? Buddy of mine has Akra Evo and said the drone between 2500-4000 rpm is pretty serious, feels like the whole car is buzzing.

Probably has an exhaust leak at the rear, im running akra slip with a bw header/x setup and it is fair to say this setup is quiet and doesnt drove ever. No other exhaust can quell a loud midpipe setup like the akra.

[Longboarder]

Originally Posted by ian27

I have not pulled the trigger on any X pipe yet. Still conducting some research!

No rasp with the current stock x pipe and Akra muffler.

By the way - because you asked in your original post - the full Akra evo system is not all titanium. Yes the rear section is titanium, but the evo X pipe is stainless steel and why it is a lot cheaper (even though it also comes with cats and resonators) than the GT4, which is titanium. The full GT4 system is incredible.

At the track when you are outside watching a v8 M3 scream by you with the GT4 system, you can "feel" the sound going through your chest. It's insane.

[BPMSport]

Originally Posted by Longboarder

By the way - because you asked in your original post - the full Akra evo system is not all titanium. Yes the rear section is titanium, but the evo X pipe is stainless steel and why it is a lot cheaper (even though it also comes with cats and resonators) than the GT4, which is titanium. The full GT4 system is incredible.

At the track when you are outside watching a v8 M3 scream by you with the GT4 system, you can "feel" the sound going through your chest. It's insane.

The Evo X-Pipe is titanium as well. It’s not stainless steel.

[aus]

I had the Akra X-pipe before and now have the Evolve X-Pipe. I was hoping to cut down on the smell my wife hates but it still smells about the same. I didn't notice much in terms of sound difference.
Evolve said they played with catless and 200cpi cats and there wasn't much difference in power in the secondary location.
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