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So the exhaust arrived. Arrow don't seem to have any UK dealers but a fella called Genialmoto on eBay does ship to the UK so he got the order. Took about 3 weeks to arrive but once he shipped it was pretty quick so I reckon it was a custom order from the factory. Anyhoo, the workmanship is superb, as you might expect from an established brand like that, and fitting took no more than 15 minutes. The weight difference is spectacular and the new pipe fits very nicely.


Out with the old...





In with the new





Big difference in size and weight of the pipes!





dB killer is secured with a neat little circlip arrangement.





Picks up neatly on the existing mounting points.





First impressions are a pleasing but not excessive increase in exhaust noise - Arrow claim 2dB and I'd say this is about right. It actually sounds a bit like a motorbike when you ride it now, and it seems to have boosted the mid range quite noticeably (though whether that's just because it sounds like it's pulling we'll see). You could make more noise by removing the dB killer if you wanted but I think it would get quite objectionable quite quickly.


Next step, ride it for 50-100 miles to allow the FI system any settling in, then start playing with the power commander.



https://www.arrow.it/en/assembled/1484/Honda-MSX---GROM-125-2016-2018
 

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I haven't read the whole thread but since no one has added anything in a half year, I'll post mine and assume it's not a duplicate...





I really like how nothing sticks out anywhere on the bike
It's totally tucked in under the seat.


jLxxtKk.jpg


The TOCE is half the weight of the stock exhaust. It's also a very long exhaust, even longer than the folded ones. While short exhausts are great for high rpm horsepower, long exhausts enhance low rpm torque. I ride my Grom for transportation so I want bottom end pull so I don't need to rev the engine as much. It produces more than enough low rpm torque so I can short shift without lugging the engine.

This exhaust totally changed how the bike performs. I climb the same hill to go to town. With the stock exhaust I needed to climb it in third gear. Now it goes right up in fourth gear. The engine also had this kind of "rubbery" vibration with the stock exhaust. There is no vibration at all with the TOCE... however the vibration has been replaced with sound. Man, this exhaust is L O U D. It idles loud, it runs loud, and it decelerates even louder. I absolutely LOVE the sound of this pipe! We're in the middle of a rainstorm right now but when I have a chance to ride I'll post a vid.

Found a video. It's not mine but it's the same exhaust.

<font color="#222222"><span style="font-family: Verdana">
 

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. I bought a 2018 with 675 miles on it recently that was completely stock other than a cheap, low mount Aodonly exhaust. The bike was exceptionally slow even for stock Grom standards. So I gutted the airbox, added a K&N, and got a Power Commander 5 with a preloaded map for these mods from you all. The bike is still a total turd even after these mods. I am 200 lbs and the bike still struggles to get past the 50-52 mph range. Is it possible that this exhaust is simply too free flowing? Does the loop in the header pipe on some systems really help?
 

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. I bought a 2018 with 675 miles on it recently that was completely stock other than a cheap, low mount Aodonly exhaust. The bike was exceptionally slow even for stock Grom standards. So I gutted the airbox, added a K&N, and got a Power Commander 5 with a preloaded map for these mods from you all. The bike is still a total turd even after these mods. I am 200 lbs and the bike still struggles to get past the 50-52 mph range. Is it possible that this exhaust is simply too free flowing? Does the loop in the header pipe on some systems really help?
I think you would be much happier with a larger bike. A Grom is just a scooter with a gearbox.
 

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Or bought a Z125 for cheaper like my buddy did who runs off from me on a completely stock bike. I just thought a Grom would keep up. I guess I'm wrong.
 

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. I bought a 2018 with 675 miles on it recently that was completely stock other than a cheap, low mount Aodonly exhaust. The bike was exceptionally slow even for stock Grom standards. So I gutted the airbox, added a K&N, and got a Power Commander 5 with a preloaded map for these mods from you all. The bike is still a total turd even after these mods. I am 200 lbs and the bike still struggles to get past the 50-52 mph range. Is it possible that this exhaust is simply too free flowing? Does the loop in the header pipe on some systems really help?
This is obviously hard to evaluate over the internet, but I am just wondering if you would be better served by returning the bike completely to stock, along with getting it fully dialed-in for stock, and then assess / modify from there. I am about the same weight as you, and my mostly-stock Grom gets me into the mid 50s pretty reliably. I would be really curious what your bike would pull with a stock exhaust and an ECU re-set. Just an idea; I am no expert in these matters.
 

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Here's another exhaust to add to the list of available ones. It's a stock Grom exhaust with no muffler. :)


Rzl9RGc.jpg



UF01UKZ.jpg

I was curious how just the cat alone would sound. It's surprisingly quiet, maybe a little deeper, with no muffler and hardly any different than with it.



Makes me wonder why they even bothered to put one on. (lol) I ended up removing the small slash tip which made the sound even deeper as the exit is larger in diameter. Rode it around today like this and the engine runs just fine with it. I'm going to ride it enough to get a gas mileage reading just to see how it compares to the toce exhaust.

...and it's a free mod! :)
 

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Here's another exhaust to add to the list of available ones. It's a stock Grom exhaust with no muffler. <img src="http://www.hondagrom.net/forums/images/smilies/smile.png" border="0" alt="" title="Smile" class="inlineimg" />

View attachment 79176

View attachment 79178

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I was curious how just the cat alone would sound. It's surprisingly quiet, maybe a little deeper, with no muffler and hardly any different than with it.


Makes me wonder why they even bothered to put one on. (lol) I made a slash cut tip from a scrap piece of 1" inside diameter electrical tubing, then took a hammer and a piece of wood and pounded it into the cat. Rode it around today like this and the engine runs just fine with it. I'm going to ride it enough to get a gas mileage reading just to see how it compares to the toce exhaust.

...and it's a free mod! <img src="http://www.hondagrom.net/forums/images/smilies/smile.png" border="0" alt="" title="Smile" class="inlineimg" />
NICE, I did something similar with my monkey, chopped it right behind the cat and rode it while waiting on the 99 dollar Anodizing pipe. You are right, it is not horrible, almost pleasant. But, it did have that angry moped sound. The new pipe makes it sound like my 225cc dual sport, but I need to get a Hindle for my bbk. Carve those canyons!!!! Check out the Pimp Chimp under the Monkey builds.
 

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NICE, I did something similar with my monkey, chopped it right behind the cat and rode it while waiting on the 99 dollar Anodizing pipe. You are right, it is not horrible, almost pleasant. But, it did have that angry moped sound. The new pipe makes it sound like my 225cc dual sport, but I need to get a Hindle for my bbk. Carve those canyons!!!! Check out the Pimp Chimp under the Monkey builds.
225 dual sport? Might it be a Yamaha 225 Serow? I rode one for years and thoroughly enjoyed it. I even made a supermoto out of it with an 18 inch front wheel. :)

GDIrhGE.jpg
 

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Here's another one of my experiments to add to the list. :)


A stock SF cat with a large 1 1/4" inside diameter pipe welded onto it.
 
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