Akra exhaust, loss or gain?

[greenbeast]

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Hi everybody i just installed the Akra full Ti system and will test the car later when traffic go down!

Some People keep telling me that the x5m with Akra exhaust will loss the los and mid range power while gain a bit Top end!

Will not be a good idea since is importante the low end power cuz is a SUV!

Anyone with Akra can tell about it?

Thanks!

[onfireX5]

I have one on order. You are not going to lose any bottom end. The factory exhaust flows very well. We might gain 5 to 8 hp up top. All exhaust mods are basically sound mods. Akra has a weight advantage since it is 33 lbs lighter.

[greenbeast]

Originally Posted by onfireX5

I have one on order. You are not going to lose any bottom end. The factory exhaust flows very well. We might gain 5 to 8 hp up top. All exhaust mods are basically sound mods. Akra has a weight advantage since it is 33 lbs lighter.

awesome news... but I think more than 33 lbs saving, is more about 70 lbs.

[onfireX5]

http://www.akrapovic.com/#!/car/prod...69&yearId=4598

[onfireX5]

Specs

[VGM6]

Onfirex5 is definitely correct. The horsepower gain is very minimal I did a before and after Dyno run of the car and didn’t see much of a difference which was expected since there are no cats except for in the downpipes and unfortunately that’s separate from the system. I have downpipes coming in and I’ll be doing another dyno run after the install to see the difference and record sound as we’ll. As he’s also mentioned most of the gains are in the weight reduction since only a titanium exhaust will lose this much weight.

[onfireX5]

Originally Posted by VGM6

Onfirex5 is definitely correct. The horsepower gain is very minimal I did a before and after Dyno run of the car and didn’t see much of a difference which was expected since there are no cats except for in the downpipes and unfortunately that’s separate from the system. I have downpipes coming in and I’ll be doing another dyno run after the install to see the difference and record sound as we’ll. As he’s also mentioned most of the gains are in the weight reduction since only a titanium exhaust will lose this much weight.

Please post up your results after the cat delete. I've not been able to find an independent Dyno of one on the X5M with only cat delete. In the LT4 650hp Zo6 Corvette it has shown a disappointing gain of 6 to 8 rwhp on multiple cars. I thought it would be higher but the GM cats flow well. Will be interesting to see the BMW results. GM does sound much better catless, just not a huge power gain at 650 hp.

[VGM6]

Originally Posted by onfireX5

Please post up your results after the cat delete. I've not been able to find an independent Dyno of one on the X5M with only cat delete. In the LT4 650hp Zo6 Corvette it has shown a disappointing gain of 6 to 8 rwhp on multiple cars. I thought it would be higher but the GM cats flow well. Will be interesting to see the BMW results. GM does sound much better catless, just not a huge power gain at 650 hp.

For sure I will. It?s annoying how so many people have done it but no one has either dynoed or will post it. I?m doing it more for the sound any way so I won?t be with a broken heart if it doesn?t make crazy gains but I?m thinking at least 20hp should be made going catless.

[onfireX5]

Originally Posted by VGM6

For sure I will. It?s annoying how so many people have done it but no one has either dynoed or will post it. I?m doing it more for the sound any way so I won?t be with a broken heart if it doesn?t make crazy gains but I?m thinking at least 20hp should be made going catless.

What did your X5M Dyno with the Akra ?

[VGM6]

From 509 AWHP and 546 AWTQ to 513 AWHP and 554 AWTQ

[onfireX5]

Originally Posted by VGM6

From 509 AWHP and 546 AWTQ to 513 AWHP and 554 AWTQ

Dynojet ?

I'd be happy with that gain when my Akra arrives as i expected nothing. M built a great exhaust and intake system.

I've looked for an awd dyno and only found a Mustang awd 2.5 hours away. My Vbox shows a consistent 0.80 to 0.90 reduction in time 0 - 100 mph with RaceChip, but i'd like to get a dyno also.

[VGM6]

Originally Posted by onfireX5

Dynojet ?

I'd be happy with that gain when my Akra arrives as i expected nothing. M built a great exhaust and intake system.

I've looked for an awd dyno and only found a Mustang awd 2.5 hours away. My Vbox shows a consistent 0.80 to 0.90 reduction in time 0 - 100 mph with RaceChip, but i'd like to get a dyno also.

Yes sir on a Dyno Jet. I?m a little un sure what to get tune wise for the future only because I?m debating doing a pure stage 2 most likely with DME tuning since they have the most experience once warranty is out. But don?t like the idea of having to pay for a tune twice. Mainly want a tune for now just to get rid of the check engine light due to no cats and I?ve considered using the awron Guage with the CEL Delete option but I don?t know if that clears the light by resetting adaptions or it has another way?

[onfireX5]

DashCommand resets as well. Afaik, they all reset adaptations unless the code is turned off in the DME.

[onfireX5]

Also check with Ben at RG Sport. Some of the mini cat Simms are getting better like Dads.

[VGM6]

Originally Posted by onfireX5

Also check with Ben at RG Sport. Some of the mini cat Simms are getting better like Dads.

Ya what I?m actually hoping is that the awron Guage doesn?t delete the code through resetting the adaptations. It just doesn?t seem like a very efficient way to have the light not come on. Can you imagine the computers having to adapt over and over again all for the sake of not having the CEL come on. Lol. I?m not familiar with coding the CEL out with out a tune. But if anyone has experience or an opinion. I?d greatly appreciate it.

[onfireX5]

Originally Posted by VGM6

Ya what I?m actually hoping is that the awron Guage doesn?t delete the code through resetting the adaptations. It just doesn?t seem like a very efficient way to have the light not come on. Can you imagine the computers having to adapt over and over again all for the sake of not having the CEL come on. Lol. I?m not familiar with coding the CEL out with out a tune. But if anyone has experience or an opinion. I?d greatly appreciate it.

If it plugs into the OBD2 ALDL port, it probably resets the adaptations. I tune all my GM turbo systems and they reset through the ALDL. It's not the end of the world since the ltrims resets the strims fairly quickly....just not the best way.

Tuning the CEL out is cake...they just uncheck the "report" box...stops it cold.

Only thing I don't like about tuning BMW (and do not have the software to do it), is you physically have to crack the ECM DME to allow the tune. Bigtime warranty killer.

You can just Flash Tune GM with touching the ECM....but they are getting smarter with Flash Counters, etc to see if you have been in there.