I am sure many of you have done some good research and/or are thinking about getting the TOCE T-Slash slip on exhaust on their CBR 600rr's, so had I, but, this is my story:
I had received the exhaust to London UK in a very well packed parcel, the finish of the exhaust looked perfect, all the extra pieces I had ordered with it (brackets, FE, etc.) were all included in the parcel as well. All good.
The install was very easy too, just undo the side foot peg, remove the heat shield dismantle the OEM exhaust and slip on the new one adjusting it correctly and tighten it on. Finish, job done.
First initial reaction of the switch on of the engine: Wow-effect! Sounded amazing, including a deep roar on lower rpm's.
Corse! Got my helmet on straight away, but hang on, whats that ringing IRRITATING noise in my ears! (This must have to do with the Doppler effect I thought) ...This thing was so loud! Initially I thought I can get away on my daily commute with not wearing ear plugs, but after arriving in my office with my ears ringing I thought no way! This thing can ONLY be ridden WITH ear plugs! What a pain! (Of course on longer rides on motorways ear plugs are an absolute must, but we are talking a 20 min. town commute, nothing heavy!)
I thought fine, fair enough.
Funny enough on my commute back from work, I started getting this 'uh oh!!' feeling, this is funny I thought, where is my lower rpm punch gone from my 600 cbr?! Maybe just give it a couple of days to run in perhaps??
Well, it didn't help! On the contrary! It got worse! The low end grunt of the engine had gone! Completely pulverized! Very little pull from idle to about 8k rpm - nothing there! It felt like I was almost held back by a rubber band!
I then went to have it custom mapped, including giving the engine some more air by fitting a BMC f.1 air filter.
Well, did this do the trick you think? NOO! You can only imagine my disappointment when I got my CBR back only to find that, yes, the power curve was a lot smoother, BUT, the lack of lower end power definitely was NOT cured!!
So there I was, having spent all that good 'ol money on an exotic exhaust from the States, having also fitted a $100 air filter, spent hundreds on a PC V unit including a custom map only to find, yes, looks wise it the whole thing was bloody AWESOME, but performance wise a complete DUD!!
So now what? Solutions you ask?
-1 sprocket to the front? Will that help? Perhaps. Then I thought am I going to spend even more money on a complete sprocket kit including fitting a brand spanking new chain??! (having read the advice given here from other members that one should always change all of the sprockets and the chain as well).
Then I thought, hold on! Why not let me read up about making my OWN custom slip on DIY baffle! Dr Google was very helpful in this endeavor! I soon found out that indeed, fitting a straight through exhaust will cause for there to be less 'back end pressure' resulting in a low rpm fatigue!! So I certainly was not the only one having had this issue!
Next, what am I going to do? Remove the TOCE original baffle and replace it with my own? Maybe. But then I had an idea of just fitting my own baffle ON TOP of the existing factory TOCE baffle!
And that's exactly what I did! ...And guess what?!! Not only had I cured the noise problem (she sounds lovely now!) but also, in a snap of a finger I had all of my low end rpm grunt back again!!!
So there you have it! You can have best of both worlds I would like to think, a damn good looking slip on exhaust (debatable of course!), still decent sound (ok, so it doesn't sound so manic as with just having the original TOCE baffles in - but hey! It is a damn good compromise!), AND you have your low end power back again.
My future plan for now:
I am due for another custom (re)-map on the dyno, I want to do this as I am now having much more back end pressure, I have a feeling she is running too rich now, so she needs another map again.
And, I want to experiment with using a fibre wool instead of what I am using now which is your standard good old steel wool.
Ok. there you have it!
I will over the next coming days post some simple photos with a 'how to do it' instructions so that if you were, or are planning to purchase this straight through race type exhaust but had your reservations about the so much talked about noise issues, and the unfortunately NOT so much talked about loss of low end power issue, well, there is a fix for this right here! :)
Oh, before I forget, I posted a small video on Youtube on how the TOCE exhaust sounds right now with my custom baffles in, I will post another video soon showing off the original TOCE sound exhaust so that you can directly compare the two. Here is the video link:
Also, if anybody needs a PC V custom Dyno map, using as said above a BMC f.1 air filter in combination with the TOCE exhaust, let me know please, I will post the file up here as well.
Cheers guys! Greetings from London,