BEST exaust system?, info welcome!

I have an 07 SD, current mods include:
Motohooligan air box
FMF slip-ons
02 Eliminators

mods soon to come (parts on order):
SAS elimination (Motohooligan)
trimmed secondary throttle plates (motohooligan)
tune ECU
40 tooth rear sprocket.

To my knowledge, the only thing left to do "outside" the engine would be to upgrade the header tubes. This is where it gets a bit complicated.
To use the EVO SS or Ti race exaust, i would need to by the cans that fit them (or at least the y-pipe, witch to my knowledge is not available separately) and this means trying to sell my beloved FMFs.
Buy a new or hopefully used 08 SDR "stock" header and keep my cans.
From what i can tell looking at pics, the stock 08 SDR are more equal length that either the race EVO or stock SD pipes, and unless someone can show me that the "race" EVO system is better in any way (other than weight of oil plug access ) I think the 08 SDR would be the way to go.

either way will be expensive, so i want to get the best set up, the SS EVO pipes are $800USD, but not sure what the cans to fit them will cost, cost ranges from $1200 to $1800!! USD, not sure which ones actually fit the pipes, but 1800 is a bit ridiculous for a set of cans!

on the other hand, looks like a new 08 SDR header (front) PN 61105107000 and PN 61105108000 (rear) totals just over $1400 USD.

So, a few questions if anyone has answers.

Anybody out there have dyno results comparing these pipes ( i.e. owners of an 08 SDR that put on the EVO system )

Has anyone modified the SS or Ti EVO's to work with stock style Y-pipe?

Thanks

Joe

The Evo Race headers will not fit your FMF cans. They only fit the Akro Evo Race cans, so it's a full system or bust. The Akro SS headers will fit the FMF cans but I can't see them bringing you a huge performance gain, as these are the same headers that SDR's come with from the factory.

I will try to post some pics, but the Akro SS pipes that came on the 08 sdr are quite a bit different than the pipes on it now, larger diameter and more equal length, as well as smoother bends and welds.my guess is that these pipes are responsible for much of the power difference between the sd and sdr. The evo system looks more like the stock pipes, but no way to tell without direct experience hence the reason for my question.

I gathered pics in this thread:
viewtopic.php?f=1&t=17192#p199694

Nice, thanks Bert

The exhuast helps a little but the main things that push the R above the standard SD are it's internals. Better flowing heads, bigger valves, and more aggressive cam profiles help the R breathe a lot better. Without those mods I can't see the Akro SS headers being worth the money. Just my 2 cents of course.

[quote="990 WFO"]The exhuast helps a little but the main things that push the R above the standard SD are it's internals. Better flowing heads, bigger valves, and more aggressive cam profiles help the R breathe a lot better. Without those mods I can't see the Akro SS headers being worth the money. Just my 2 cents of course.[/quote

Really... , I knew the R had different valves and larger TB's but I thought I read somewhere that the cams were the same. Good info is hard Ti come by sometimes....

I'm any case I am kicking around the idea of tearing into the motor this winter, and doing some head work to up the CR and increase the flow. The header issue is part of the shceme, just looking at the tubes it is apparent to me that the stock R tubes might have an advantage over even the evo system, mainly due to the more equal length runners. But there is know way to tell if the inner diameter is the same, nor without a dyno is there a way to prove witch is supiroir if any. In any case,I am confident thet either is better than the stock SD pipe, especially when mods are involved.

On second thought I may be wrong about the cams...not 100% sure on that. But still a header isn't going to really supercharge your bike unless you allow it to breathe in more air first. I have basically the same bike as you and was contemplating doing the same thing (buy a header). I realised after a while it just wasn't worth the cash (to me), so my next mod will be upgrade to a hotter set of cams and higher compression pistons (no idea when I'll get into that).

My 2cents.

Do the SAS block offs, Forget the secondary flies all together, Fit the 40T sprocket and ride the shit out of your bike a little on the rich(arka map) side to keep things safe...

Again just 2cents...

tearing out the 2nd flies and fitting full system took mine from 123bhp to 129.43bhp. 06 SD For the 123bhp dyno run it had round slip-on Akra and Motobox.

Taking out the flies and shafts makes a huge difference in how the engine behaves... Its like different bike

Yeah when I took out my flies and shafts it made the bike much smoother. Great mod for the 20-30 minutes it takes. I wish I could experience it right now but I lost my FUGGIN key to my bike! Gotta get on the phone with KTM or a locksmith and get that taken care of; my TuneECU cable gets here soon.