So I'm up between the two for my new 2011 Blk. 750. Has anyone had any experience with the two? I know the HP isn't that much of a gain with an exhaust but i'm really looking for sound. I'm looking for a deep sharp sound. What do you guys think???:dunno

I'm running a Yoshi RS-3 that I cut down to an 11" shorty and I love the sound, not to loud. But when you full throttle it, everyone will hear you coming

You can't go wrong with either....

i'm thinking M4 for mine personally....

m4, Yosh, and Akra are all great exhaust. YOu won't regret any of them. Go with what you like the looks/price of.

Yea I just looked at the two exhausts on you tube and they pretty much sound identical. I understand that it's through a video camera and it doesn't do any justice but those are my findings.

The Yosh systems are really nice. Besides, Yoshimura is to Suzuki like Bosch is to BMW, so you'll never go wrong.

That said, I really - really dig Akrapovic pipes. Even HRC admitted defeat when a pipe designed and built by Akrapovic created more power than the HRC version when it was bolted to a MotoGP bike! That is cred you just can't get anywhere else.

I've had both and prefer the Akra. It has a deeper sound between the two.

Both are good but I think the Akra is better build quality.

That being said Yosh japan is probably equivalent to Akra (remember there us Yosh US and Yosh japan :) )

If slip-on I would just go with your personal preference because you won't see any real gains. Since its almost impossible to find someone with your exact year/make/model bike that already has the exhaust you want on it so that you can hear it you may just have to google some you tube videos of previous models with the pipe. Thats what I do. As for me right now I just picked up a gp style m4 from motomummy (great price btw and love the free shipping) for my '11 750 for now because I'm on a very tight budget for the next year but later I plan on getting either a full akra or arrow system and the works.

post some pics when you can

Did someone say pictures? :D :D :D

http://www.ridersdiscount.com/forum/akrapovic/exhaust_akrapovic_fs_gsxr600k8_14.jpg

http://www.ridersdiscount.com/forum/akrapovic/exhaust_akrapovic_fs_gsxr600k8_8.jpg

**K8 version shown**

By the way, don't get too excited - Akrapovic pipes for the new GSX-Rs aren't expected to be released until early June (for slip-ons) and late June for the full systems. :(

What interests me (full system) is:
1. is it lighter (really lighter, not like a pound)
2. Can I demonstrably improve mid-range by combining a full system with a high-flow air filter and some sort of FI tuner (PC, Bazzaz, etc). Not really interested in total HP gain, but a bigger bulge in the middle would be awesome (insert joke here)
3. Can I retain the dual throttle modes
4. Will that tune stay relatively stable so I don't have to fuss with it.

1. full system is about 15-20 lbs. lighter than stock
2. a system with a full muffler not the stubby ones is better for midrange power
3. if your talking about the A,B,C mode the Yes
4. a good custom dyno tune should stay stable

sick pics!

i wanted the full m4 exhaust for my old gixxer. I think removing the cat is a must. The video clips on you tube sound so good , same with Akra full system

15 - 20lbs?!? I realize the cat is a bit heavy, but the stock pipes must be similar material and the stock can might be a bit heavier due to more packing, but jeez. Seriously? We're talking about sub 400lb bikes with one mod. I was thinking 5lbs weight savings. maybe.

Long pipe and full muffler for better mid, but surely much of what could be available would have to come from the tune.

Akrapovic claims a weight savings of a little over ten pounds compared to stock with their full system installed.

I wonder how much of that is just the cat.

most of the weight loss is the cat but the aftermarket headers are usually a thinner wall thickness than stock, so there is some additional weight loss

Im really interested in this tread. I hope to get an exhaust next month. For the price i been looking at the M4 slip on, but I been reading the Akra/Yoshi exhaust tend to be better.

My apologies but do most of you change the stock exhaust to aftermarket to be heard better while out in traffic?