Complete race pipe K6-K9 GSX-R600

[FROSTY:Me]

Hey guys Ive got a track use only GSXR600 K7 fitted with a Lovely looking and sounding Leo Vince system.
At High RPM she pulls like a schoolboy but theres a massive hole in the midrange.
Mr tuner is well reputed and has told me the pipe is the cause of the hole.
So Im looking for a Yosh or similar race pipe Ie a complete system for the K8-L1 600
Im hoping that with the K7 being "old hat" someone will have something lying around.
Ive edited to remove any price indication

[mossy1200]

GSXR600 K7

Run it with a db killer and check the midrange. Sounds like a lack of back pressure.
If its better sleeve the mid pipe down a bit at the muffler end and remove the db killer again.

If you post the internal size of the muffler inlet someone will have a db killer the correct size.

[FROSTY:Me]

what the heck is a DB killer?

[Gremlin]

https://www.google.com/search?q=db+k...w=1920&bih=938

Removable baffle.

[FROSTY:Me]

Thanks guys but I do want to get a K8-L1 full system

[mossy1200]

Thanks guys but I do want to get a K8-L1 full system

So when you said Leo Vance System you meant Leo Vance Muffler?

I would have thought going even bigger bore and flow exhaust system is going to make the midrange worse instead of better.

[oohook]

PM me if you're interested in selling the LeoVince. Cheers

[FROSTY:Me]

So when you said Leo Vance System you meant Leo Vance Muffler?

I would have thought going even bigger bore and flow exhaust system is going to make the midrange worse instead of better.

To be honest mate --I don't know and don't personally have the time to think about it.
mr Clee says.--"Put a Yosh K8-L1 race system on" So I bows down and goes yessum massa.--given he has a "bit" of experience tuning this sort of bike I figure he knows what he's talking about.

[mossy1200]

To be honest mate --I don't know and don't personally have the time to think about it.
mr Clee says.--"Put a Yosh K8-L1 race system on" So I bows down and goes yessum massa.--given he has a "bit" of experience tuning this sort of bike I figure he knows what he's talking about.

These systems new are 2.2k landed including gst. Your going to need be very lucky to find a second hand race set for sale cheap.

[FROSTY:Me]

These systems new are 2.2k landed including gst. Your going to need be very lucky to find a second hand race set for sale cheap.

Ohh well 2.2k it must be then

[Drew]

Run it with a db killer and check the midrange. Sounds like a lack of back pressure.
If its better sleeve the mid pipe down a bit at the muffler end and remove the db killer again.

If you post the internal size of the muffler inlet someone will have a db killer the correct size.

'Back pressure' is a really misleading and counter productive term. People need to stop saying it.

It's all about pipe length and size, creating the much needed 'correct' velocity to maximise the gains from valve overlap. Play with yer cam timing, and you're doing half the job. Play with the exhaust dimensions and you are usually making more noise and little else.

[mossy1200]

'Back pressure' is a really misleading and counter productive term. People need to stop saying it.

It's all about pipe length and size, creating the much needed 'correct' velocity to maximise the gains from valve overlap. Play with yer cam timing, and you're doing half the job. Play with the exhaust dimensions and you are usually making more noise and little else.

So your saying Leo make system incorrectly or its a system not designed for the bike.
Goes back to trial with db killer at back of midpipe in front of muffler and sleeve midpipe down if the fault goes away discarding the db killer. I am picking the midpipe is a little fat. With a $400 budget its the only way to find out without committing mega monies.

Or buy a tuned system you know is correct but they are not cheap.
Idd like a new system for mine but they are priced the same as many new lams bikes.

[Grumph]

So your saying Leo make system incorrectly or its a system not designed for the bike.
Goes back to trial with db killer at back of midpipe in front of muffler and sleeve midpipe down if the fault goes away discarding the db killer. I am picking the midpipe is a little fat. With a $400 budget its the only way to find out without committing mega monies.

Or buy a tuned system you know is correct but they are not cheap.
Idd like a new system for mine but they are priced the same as many new lams bikes.

what he is saying is 1/ believe your engine builder as he knows more than a random poster on KB...
and 2/ The leo vince system doesn't work with that cam/head combo but the yosh one does....

My own very limited experience of leo vince systems pointed to the same thing, not a bad road system but change the camming and there were problems...

[mossy1200]

what he is saying is 1/ believe your engine builder as he knows more than a random poster on KB...
and 2/ The leo vince system doesn't work with that cam/head combo but the yosh one does....

My own very limited experience of leo vince systems pointed to the same thing, not a bad road system but change the camming and there were problems...

Don't doubt you but OP original post has a $400 budget. Bet he wasn't told he would find a complete Yoshi system in some ones back yard for that price.
Racing perfect bikes doesn't leave any room for a budget. $400 is 2/3rd of the price of a set of slicks.
Does Frosty want to win or turn up. If its win then pay 2.2k for a system that his tuner is asking for. That's cool. I know how to spend money racing bikes.

[Gremlin]

Aftermarket exhaust systems have been proven in the past to often provide very little gains, sometimes even being worse than stock. Others can yield good gain.

Obviously that varies from brand to brand, but is one major reason why the likes of akra, yoshi etc cost more than the cheap systems. A lot more R&D has gone into design.

FWIW, when I had a Racefit, with baffle in, there was a hole the tuner couldn't correct, that was easily solved with the baffle removed.

Essentially as Drew said, trust the engine tuner/builder over others eh?