Topic: CB750 and new Mac 4-2 pipes - too loud!!!

[andy750]

I had a set of MAC 4-2 pipes before and Im sure they were quiter than the new ones I currently have on my CB750K4. Dosent appear to have removable baffles or any baffles at all! Has anyone had success in making these a little quieter. I sound like a Harley coming down the street (blub, blub, blub.....) and people turn around to see whats coming and small children run screaming  . Looking for something that sounds more like my 4-4 pipes on my K2.

Any advice on what to do?

cheers
Andy

[KB02]

Could you post a picture of the cans?

[mlinder]

Can you weld? I don't think baffles are too terribly hard ot make if you can weld. Can make glass packs.

[MRieck]

 The extra compression in that engine contribute to some of the new found noise Andy.

[Master Ted]

MAC advertises removable baffles except for turnouts and tapered tips:

http://www.cyclewareables.com/pages/exhausts_mac_systems/macexh7.jpg

If you don't return for a baffled version then you can add them... May require slicing off turnout tip or such, a bit of fabrication and, more money.

[andy750]

Thanks guys for the feedback. Ill post some pics tomorrow as bike is at home (rode the cafe today). The pipes are the turnout kind so looking at the link above they dont have removable baffles...I guess without cutting into them (no tools for that) Ill need to live with it......

Thanks Mike that would make sense about more compression = more noise. I want to make a video of how the bike now sounds so you can see for yourself how the engine sounds - it really is throaty!! I am enjoying the power for sure! Still havent had the chance to take it on the highway yet but Im eager to try this....I want to see what sort of top end difference its made. I was going to order the 17t front sprocket (like I have on the K2) to give it a little more acceleration at low end :-)

cheers
Andy

[RSV12K]

I have the Macs (megaphone style) on my CB750K7 and they're loud too, especially when you get on the gas. I like loud pipes but these are a bit too much. I've been running them for only 500-600 miles and I swear they're getting louder by the day.

I hate the thought of having to buy something else but it may come to that. The fit and finish of these things is crappy anyway. It wouldn't surprise me if all the packing blew out.

[pyro139]

cool, i been looking for pipes to make children run screeming do they make them for cb650c?

[Jerry Rxman Griffin aka MuthaF'er]

Andy,

2 words - EAR PLUGS?!?! My Vance & Hines Pro Pipe 2 into 1 on my Fat Boy started out "relatively" quiet until the packing apparently burned out. Ear plugs now because I haven't attempted to repack it. "Sounds" like (no pun intended) you don't have that option. Or EBay 'em and start over? 

[andy750]

Ill see how it goes and then if I cant stand it switch my 4-4 from cafe K2 over to the K4 and put the mac 4-2 on the K2. Mike made a good point that my freshly rebuilt K4 engine (by Mike!) is going to be noisier than the K2 due to the higher compression.....anyway since I have no choice Ill ride and see if I can get used to it....watch this space for a video.....

cheers
Andy

[ProTeal55]

More Compression is gonna make more noise, weather it is in a car/motorcycle/boat/etc..
I for one am a huge fan of compression (the higher the better), but with that comes more issues..
I cant see how you guys don't want loud pipes, but to each their own...

Your best bet is making your own baffles for your new pipes, and then you can get them as loud as u want..
I know Parts Unlimited sells baffle packing material by the bag for just these occasions...

[gregwaits]

I am leaning towards favoring pipes that are loud but not overly so. At least the car drivers have a better chance of knowing you are around. I would much rather be making noise with my throttle than by screaming in agony laying on the pavement.

[pyro139]

I am leaning towards favoring pipes that are loud but not overly so. At least the car drivers have a better chance of knowing you are around. I would much rather be making noise with my throttle than by screaming in agony laying on the pavement.

loud pipes save lives, my honda cb650 running side drags, my 50cc scooter running high compression high pitched exhaust sounds like a chain saw in a cave.

[KB02]

loud pipes save lives.

Loud shirts save lives, too.

If your argument for loud pipes is that they make you more conspicuous when riding, and you don't ride with bright reflective strips all over yourself and your motorcycle, bright colored helmet and reflective jacket, then I'll just call you a hypocrite.

Don't be scared, call it what it is. You like loud pipes because you think they're cool.

Have you seen all of the sound insulation they are putting into these luxury cars driven by the most inattentive drivers these days? They're designed to muffle you out.

Okay... I'm off the soap box. Rant over.

[pyro139]

my gear has scotchbright tubbing so durring day looks like wearing pure black at night and in tunnels cars lights light me up like a x-mas tree.

[Jerry Rxman Griffin aka MuthaF'er]

I won't argue about wearing brightly colored riding gear but the women driving the battle tank minivans and talking on a hand held cell phone while they are increasing their ass size by eating donuts simultaneously as they are looking over their shoulder yelling at the wonderful kids they raised to be brats sure as hell won't be LOOKING for brightly colored riding gear unless it's a "cute outfit" SO perhaps it's not a bad idea to wear our earplugs while we appeal to another of their senses - HEARING. Defensive riding skills also help.

[KB02]

Defensive riding skills also help.

Now on that point, we are in total agreement!!

[pyro139]

Defensive riding skills also help.

Now on that point, we are in total agreement!!

so true,
i do everything to stay vissible, but truth matter is these retards in cages dont even see a huge ass fire truck with flashing lights trying pass them, they not going see us, sound is an extra way to make self known, but ya no matter how bright you are or how loud nuthing will help if you dont know how ride your way out of a bad situation.

[RSV12K]

"Loud pipes saves lives," seems like a good idea but motorists are actually to blame for low percentage of motorcycle-related accidents:

Here’s the way the numbers for the Insurance Institute for Highway Safety shake out:

A. Motorcycle runs off the road (41%)

B. Motorcycle or other vehicle runs a red light or stop sign (18%)

C. Head on collision (11%)

D. Car turns in front of the motorcycle (8%)

E. Motorcycle goes down in roadway (7%)

More at http://motorcyclebargains.com/?p=1139

[pyro139]

"Loud pipes saves lives," seems like a good idea but motorists are actually to blame for low percentage of motorcycle-related accidents:

Here’s the way the numbers for the Insurance Institute for Highway Safety shake out:

A. Motorcycle runs off the road (41%)

B. Motorcycle or other vehicle runs a red light or stop sign (18%)

C. Head on collision (11%)

D. Car turns in front of the motorcycle (8%)

E. Motorcycle goes down in roadway (7%)

More at http://motorcyclebargains.com/?p=1139

ya but of that 41% what percent is motorcycle going off road to avoid a car that just cut them off, here in canada its would be most of it.

but good driving is important, yes a good amount accidents are bikers fooling around doing what they shouldnt, but of car on bike accidents it usualy is the car.