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Discussion Starter · #1 · (Edited)
Hi Guys...have any of you installed a K&N Airfilter and a Freer flowing exhaust on your 390?

Any noticeable performance gain from both mods?

I have ordered the K&N Airfilter for two reasons: It's washable and makes the engine breathe better...

I'm also waiting for the dealer to bring the Akrapovic slip-ons or distributors of Arrows and Scorpion to bring in their exhausts for the 390's being sold here. They say by December 2013 or Jan, 2014 they may have exhaust specifically made for the 390's as they already have the exhaust system for the 125,200's that are basically the same. Just that the 390's have a slightly bigger diameter exhaust tubing.

So if anyone has made these two mods...please let us know what performance gains have you achieved?

Thanks,
Miguel
 

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Not too many guys with the Duke 390 yet down in NA but different for you guys in europe and asia. :mad:

@mig390

From what I recall the K&N filter comes in two version Race & Street. The race version allows more air flow but thinner filter element. If you get the race filter I would suggest getting a fuel module box like a powercommander and get a custom map. Great filter by the way never by another one again adn recharge kit is cheap.

What kind of performance gain are you looking for?
with these two mods you will notice minimal gains. The bike will feel better at certain parts of the power band but with the exhaust depeding on the pipe diameter you might sacrifice some low end power. The best thing I can suggest for power is a sprocket change to really wake up the 390.

Let us know what you end up with. :)
 
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I wouldn't expect a dramatic change in performance from these mods. Once you get them installed you should give us your own personal review though. When I choose an exhaust I am looking more for the note and the look of the exhaust. Ideally it would also be light so as to not weigh down the bike.
 

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the Akra dealer here says expect 2.5~3bhp from the powerparts ... must change the air filter ... i just went out riding with 1 of them and my KTM dealer ... and it seems there is a hi-cam mod for 390 ... hmmmm ... an i think i just ordered the Akra slip-on ... cos i'm really restless without it ... duhh ... kill me !
 

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tomorrow i'l scout around if there any any dyno shop .. would really want to do an A B test ... with and without ... just to ease the pain of departing the moonies ....
 

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combined you're probably looking at max 5 bhp gains. If you go full system maybe 8 bhp gains, but with a full system you will also likely see weight savings as well. If you go full system catless you can cut down on heat leak the Dukes are known for...
 

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combines is 2.5~3bhp ...
yes catless will safe weigh and maybe extra 1~2kmh ... and yess... less heat will be expected as per the Akra dealer and KTM dealer said ...
the 390 powerparts akra is catless here in Asia .. :)

combined you're probably looking at max 5 bhp gains. If you go full system maybe 8 bhp gains, but with a full system you will also likely see weight savings as well. If you go full system catless you can cut down on heat leak the Dukes are known for...
 

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Discussion Starter · #9 ·
combined you're probably looking at max 5 bhp gains. If you go full system maybe 8 bhp gains, but with a full system you will also likely see weight savings as well. If you go full system catless you can cut down on heat leak the Dukes are known for...
I surely doubt you will get 8 bhp gain...maybe 2-3hp is more realistic....
 

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Discussion Starter · #10 ·
combines is 2.5~3bhp ...
yes catless will safe weigh and maybe extra 1~2kmh ... and yess... less heat will be expected as per the Akra dealer and KTM dealer said ...
the 390 powerparts akra is catless here in Asia .. :)

Guys...ALL SLIP-ONS ARE CATLESS!!!...slip-on removal starts where the Catbox is located which is infront of the rear shock...so a slip-on already eliminates the catbox no matter what brand...infact you dont need a full system...
 

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Discussion Starter · #11 ·
tomorrow i'l scout around if there any any dyno shop .. would really want to do an A B test ... with and without ... just to ease the pain of departing the moonies ....
A and B test????

What you meant was...you want to do a Dyno via BASELINE test with stock exhaust and stock Airfilter...then do another Dyno Test with the exhaust and airfilter....

Only way to check and compare...
 

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Discussion Starter · #12 · (Edited)
Not too many guys with the Duke 390 yet down in NA but different for you guys in europe and asia. :mad:

@mig390

From what I recall the K&N filter comes in two version Race & Street. The race version allows more air flow but thinner filter element. If you get the race filter I would suggest getting a fuel module box like a powercommander and get a custom map. Great filter by the way never by another one again adn recharge kit is cheap.

What kind of performance gain are you looking for?
with these two mods you will notice minimal gains. The bike will feel better at certain parts of the power band but with the exhaust depeding on the pipe diameter you might sacrifice some low end power. The best thing I can suggest for power is a sprocket change to really wake up the 390.

Let us know what you end up with. :)

Oh no...I have to check what I ordered... I must have ordered the Street version though, which is still ok with me, as it will still breathe better than the stock paper element type. With regards to gains...well I'm hoping with these gains..Hmmm... I would get a minimum of 3bhp increase which will be fine for a light bike as the 390...I'm not expecting major gains but I do want some performance improvement with an exhaust and airfliter mod.

Yes...I plan to go 2 up on the rear with a better looking aluminum and lighter sprocket as the stock's steel black sprocket looks cheap and heavy. Will also replace my 520 chain with new gold chain...I find 6th gear too tall...so, with a Plus 2 rear..it should be able to pull in 6th gear much better. Stock is 45T...I will go 47T... replacing the countershaft sprocket to a -1 will technically increase rear equivalent to a +3...which I think, maybe too much...

I would rather replace the ugly looking stock sprocket with a better looking lighter aluminum one with a lighter 520 gold chain....to add some punch and bling.
 

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Yes .... Before and After ... so far... no dyno bike machine here ...
My K&N Filter is KT-1211 what is urs ? is that normal or racing type ?


A and B test????

What you meant was...you want to do a Dyno via BASELINE test with stock exhaust and stock Airfilter...then do another Dyno Test with the exhaust and airfilter....

Only way to check and compare...
 

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Discussion Starter · #14 ·
Yes .... Before and After ... so far... no dyno bike machine here ...
My K&N Filter is KT-1211 what is urs ? is that normal or racing type ?

Hi Phil...yes we have the same part # KT-1211...

Not sure...could be the "street or Road" version....
We have two Dyno shops here in Manila....so maybe I will try to make an appointment to do a baseline test...then when Pipe and filter are inplace, do another Dyno run....
 

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Yes...u do that ... because the nearest dyno shop is at Singapore. That's 15km away from my home but their labor cost is 3~5 times more then here. Duh ...

anyway ... i can't be bring my Akra there too .... import/export issue ... so the nearest would be at my capitol city KL .. that's 450km away ... darn ...:mad:

Hi Phil...yes we have the same part # KT-1211...

Not sure...could be the "street or Road" version....
We have two Dyno shops here in Manila....so maybe I will try to make an appointment to do a baseline test...then when Pipe and filter are inplace, do another Dyno run....
 

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Yes...I plan to go 2 up on the rear with a better looking aluminum and lighter sprocket as the stock's steel black sprocket looks cheap and heavy. Will also replace my 520 chain with new gold chain...I find 6th gear too tall...so, with a Plus 2 rear..it should be able to pull in 6th gear much better. Stock is 45T...I will go 47T... replacing the countershaft sprocket to a -1 will technically increase rear equivalent to a +3...which I think, maybe too much...

I would rather replace the ugly looking stock sprocket with a better looking lighter aluminum one with a lighter 520 gold chain....to add some punch and bling.
This sounds like a good plan, I think I will look at doing the same.
 

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Oh no...I have to check what I ordered... I must have ordered the Street version though, which is still ok with me, as it will still breathe better than the stock paper element type. With regards to gains...well I'm hoping with these gains..Hmmm... I would get a minimum of 3bhp increase which will be fine for a light bike as the 390...I'm not expecting major gains but I do want some performance improvement with an exhaust and airfliter mod.

Yes...I plan to go 2 up on the rear with a better looking aluminum and lighter sprocket as the stock's steel black sprocket looks cheap and heavy. Will also replace my 520 chain with new gold chain...I find 6th gear too tall...so, with a Plus 2 rear..it should be able to pull in 6th gear much better. Stock is 45T...I will go 47T... replacing the countershaft sprocket to a -1 will technically increase rear equivalent to a +3...which I think, maybe too much...

I would rather replace the ugly looking stock sprocket with a better looking lighter aluminum one with a lighter 520 gold chain....to add some punch and bling.
Yeah that is your best bet. But one thing is that i find aluminum sprockets get chewed up easily and need replacing faster then your conventional steel. It is heavier but they do tend to last longer. The best is to replace the front, rear sprocket and chain at the same time. And after a bit when the chain stretches make sure you adjust the tension.
 
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