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Discussion Starter · #1 ·
So I finally had some time to install my Coffman's slip on exhaust tonight. Install was very straight forward. I already had the stock one off and I've been riding around without any exhaust so putting this on was easy enough.

First let me talk about the product itself.

It's definitely a quality piece - very nicely finished in a matte black. The mandrel bend in the tube is perfect and the hardware and clamps supplied are all excellent.

The fit of the slip on is exactly right and really the only beef I have is that you have to drill a hole and put a rivet into your stock exhaust stub in order to install it firmly.

I considered using a stainless screw or something along those lines and just clamping it down hard. I also thought of using teflon tape under the slip on (saw it on another video install of a slip, can't remember which one) but in the end I figured I likely would only ever take it off again if I was selling the bike and putting the stock one back on. I decided to have mine centered with the 'R3' in the bracket they provided instead of more upright. Turned out really well.

Now for the sound part which I'm sure you're all wondering about.

I had the db killer taken out right away - no point since I wanted it to be as loud as possible.

After having the bike without any exhaust for about a week and adding the slip on exhaust, I have to say that I didn't notice any difference at idle at all. Same low, burble. This is not a bad thing at all as I liked the low burble at idle without the stock exhaust.

Riding it though was a whole different ball game.

The sound while riding is amazing. It has a much more refined sound but still louder than stock. I noticed that a tiny bit of low end torque was lost when I took off the stock exhaust but with the Coffman's slip on that returned but the rev happy throttle response was not lost fortunately.

I have to say the only beef I truly have is the cover they give you isn't really bent perfectly for the bike. It does fit but not great. Let me explain - it takes a bit of fiddling with the longer screws they give you to line it up with the stock fairing and even then, its one of those 'press hard' to install affairs. Not a huge struggle but I think they could have bent the tabs better to line them up with the holes a bit better. Once its on there, there are no issues at all with clearance or anything but just a minor annoyance.

Overall, for the price, it was the most inexpensive slip on you can buy and I think its definitely one of the most understated but still attractive ones out there.

Took a few quick pics with my cell phone as I was too lazy to move the bike and get better pics but you get the idea.



 

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Thanks for the review. I ordered mine a few days ago and I am anxiously awaiting it. I like that fact that it's not another large can slapped on the side like so many are. And as we know, the price is right.

Looks good Blue!
 

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Discussion Starter · #3 ·
Thanks! It really is a quality piece. I realized after putting it on and watching one of the videos online that I may not have pushed mine on far enough - but I'm sure it won't go anywhere since I've used a rivet.

I know its been said before but the stock exhaust really is a heavy piece compared to any aftermarket unit. This one is no exception - its so incredibly light compared to the stocker.
 

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Thanks for the great review. Watching and listening to all the reviews and write ups on all the exhausts. I've definitely given this one a positive consideration now.

Much appreciated.
 

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I love mine. It was here waiting for a week for the bike to arrive. My stock exhaust was kept on for about 10 minutes before the Coffman was installed. Glad I didn't keep it stock as it sounds so much better and glad I didn't spend a lot more money for something that sounds just as good. The video reviews don't do it justice. It sounds a lot better in person.
 

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Discussion Starter · #6 ·
I love mine. It was here waiting for a week for the bike to arrive. My stock exhaust was kept on for about 10 minutes before the Coffman was installed. Glad I didn't keep it stock as it sounds so much better and glad I didn't spend a lot more money for something that sounds just as good. The video reviews don't do it justice. It sounds a lot better in person.
Agreed! Has a nice low burble to it now and sounds fantastic at WOT. In conjunction with the BMC air filter, I feel like the bike is just rev happy and doesn't sound so wheezy anymore. I don't think there is really any more power but its definitely lighter and more fun to ride so that's what counts in my book!
 

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Discussion Starter · #8 ·
Straight through, or does it have some sort of baffle, or?
It has both options. Comes stock with a baffle/db killer installed. I popped mine out and the only thing that really muffles it now is a screen in the middle and there are holes inside the muffler wall. Otherwise its straight through.
 

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Hi guys just a few questions to everyone that has this exhaust - Do you notice more poping or any loss of power? Also do you think it needs a PCV and or a Block off plate? I know that the CAT on this bike acts as the muffler but i still read somewhere that putting a slip on still changes the A/F ratio of the bike, just like a full system but less. Just dont want to cause any harm to the bike in the long run...
 

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Hi guys just a few questions to everyone that has this exhaust - Do you notice more poping or any loss of power? Also do you think it needs a PCV and or a Block off plate? I know that the CAT on this bike acts as the muffler but i still read somewhere that putting a slip on still changes the A/F ratio of the bike, just like a full system but less. Just dont want to cause any harm to the bike in the long run...
I think I might re-install my stock muffler just for observation. My bike is dangerous af the first 1-2 minutes after a cold start. It'll cut out at 7-9k throwing me forward, then hit me with everything it has, as if I were doing a throttle-chop wheelie attempt. When it's warmed up there are no issues. The muffler is the only engine related thing I've done. I'm running the Tyga not the Coffman, but that makes little difference. Yeah I hear a bit of popping, but I'm thinking that's just due to the absence of the stock muffler's baffle, not AFR change (in fact I suspect the stock muffler sounds like a loud drum because it is trying to contain those pops -- and it's actually louder on decel than my Tyga imho -- in that respect). I have the block-off plate but just haven't set aside time to do the plate install + canister removal.
 

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I have the GRAVES slip-on. No other mods. No popping or any stalls. Runs perfectly smooth. Sounds great.
I made a video showing the exhaust. It's in the VIDEO section of the forum. The GRAVES unit costs more, but I think it's worth it.
Very high quality. The Coffman is a cheap toy by comparison.
 

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Discussion Starter · #13 ·
Hi guys just a few questions to everyone that has this exhaust - Do you notice more poping or any loss of power? Also do you think it needs a PCV and or a Block off plate? I know that the CAT on this bike acts as the muffler but i still read somewhere that putting a slip on still changes the A/F ratio of the bike, just like a full system but less. Just dont want to cause any harm to the bike in the long run...
- I have not noticed any loss of power at any rpm range
- I don't know about the PCV / block off plate but I would guess its not needed since the stock exhaust is just another baffle and the slip on here is just a straight pipe basically
- I don't see how this would change the A/F ratio; a mod to the air box would do that though
- I don't think there will be any long term issues with this mod other than increasing your grin factor :D
 

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Discussion Starter · #14 ·
I think I might re-install my stock muffler just for observation. My bike is dangerous af the first 1-2 minutes after a cold start. It'll cut out at 7-9k throwing me forward, then hit me with everything it has, as if I were doing a throttle-chop wheelie attempt. When it's warmed up there are no issues. The muffler is the only engine related thing I've done. I'm running the Tyga not the Coffman, but that makes little difference. Yeah I hear a bit of popping, but I'm thinking that's just due to the absence of the stock muffler's baffle, not AFR change (in fact I suspect the stock muffler sounds like a loud drum because it is trying to contain those pops -- and it's actually louder on decel than my Tyga imho -- in that respect). I have the block-off plate but just haven't set aside time to do the plate install + canister removal.
I've had NO issues when cold. I've taken it out when its really cold (5 deg C) and had no issues
 

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I have the GRAVES slip-on. No other mods. No popping or any stalls. Runs perfectly smooth. Sounds great.
I made a video showing the exhaust. It's in the VIDEO section of the forum. The GRAVES unit costs more, but I think it's worth it.
Very high quality. The Coffman is a cheap toy by comparison.
Yeah, I can see it looks like quality built but from what i hear on the videos there is almost no difference to the sound compared to stock. The coffman has a low burlble and a bit louder from what i can tell, also looks really good on the bike.
 

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Hi guys just a few questions to everyone that has this exhaust - Do you notice more poping or any loss of power? Also do you think it needs a PCV and or a Block off plate? I know that the CAT on this bike acts as the muffler but i still read somewhere that putting a slip on still changes the A/F ratio of the bike, just like a full system but less. Just dont want to cause any harm to the bike in the long run...
I think I might re-install my stock muffler just for observation. My bike is dangerous af the first 1-2 minutes after a cold start. It'll cut out at 7-9k throwing me forward, then hit me with everything it has, as if I were doing a throttle-chop wheelie attempt. When it's warmed up there are no issues. The muffler is the only engine related thing I've done. I'm running the Tyga not the Coffman, but that makes little difference. Yeah I hear a bit of popping, but I'm thinking that's just due to the absence of the stock muffler's baffle, not AFR change (in fact I suspect the stock muffler sounds like a loud drum because it is trying to contain those pops -- and it's actually louder on decel than my Tyga imho -- in that respect). I have the block-off plate but just haven't set aside time to do the plate install + canister removal.
Hmm that is very strange.. I dont think it is likely to be related to the exhaust tho.. Did you do any other mods recently? Any electrical changes maybe?
 

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Hi guys just a few questions to everyone that has this exhaust - Do you notice more poping or any loss of power? Also do you think it needs a PCV and or a Block off plate? I know that the CAT on this bike acts as the muffler but i still read somewhere that putting a slip on still changes the A/F ratio of the bike, just like a full system but less. Just dont want to cause any harm to the bike in the long run...
- I have not noticed any loss of power at any rpm range
- I don't know about the PCV / block off plate but I would guess its not needed since the stock exhaust is just another baffle and the slip on here is just a straight pipe basically
- I don't see how this would change the A/F ratio; a mod to the air box would do that though
- I don't think there will be any long term issues with this mod other than increasing your grin factor
How about any popping? Also i saw a video of the installation and the person doing it said he smelled a lot more fumes coming out with the coffman exhaust compared to stock so it got me thinking.. If its good or bad...
 

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Hmm that is very strange.. I dont think it is likely to be related to the exhaust tho.. Did you do any other mods recently? Any electrical changes maybe?
Just LED front blinker + TST blinker module. Basically when I try to give it throttle on a cold start, it bogs and then after a certain amount of throttle it responds. I can re-install the stock blinker module and disconnect the LED front turn signals, but I seriously doubt it's related.
 

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Discussion Starter · #19 ·
How about any popping? Also i saw a video of the installation and the person doing it said he smelled a lot more fumes coming out with the coffman exhaust compared to stock so it got me thinking.. If its good or bad...
No popping at all. Yes, there is a stronger exhaust smell but again, the stock exhaust is just a different setup with offset tubes vs the slip on which is straight through. I can't say for sure but I doubt there would be any serious long term issues.
 

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You should definately give it a try cause it sounds like a short or somthing to me, although im no specialist. But its very unlikely its exhaust related cause even if you were running withought any slip on at all it wouldnt behave like that... Unless its clogged with somthin wich i doubt.
 
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