I can see no reason why the silencer would be at all protective of the CAT. I think it would be an utterly safe mod. I considered it myself with the addition of a small exhaust pipe extension fitted to the back of the CAT. But when I weighed the CAT, I said "that has to go - now!"

 

I'm with Boldor. Totally safe. The end can is just for silencing (hence the name silencer). You could run a straight through with the de-cat and no silencer as well, but you'd probably go deaf within your first ride

 

yet the Counter pressure will drop, which mean you will have to remap the engine.
after all the can do add some Counter pressure...

 

Only the auto-cold-start remap. The back pressure from the silencer through the cat would be virtually nothing.

Not an issue.

Put an exit pipe on your cat sneaky. Like I said earlier I considered your mod, before I weighed that PhatCat. My biggest fear was exhaust crap landing on the rear tyre. Any exhaust modder/fitter will be able to knock one out out for you.

 

Yes and no, it will run without a remap, however to get it to run optimally you need to remap the injection system (ECU) (not the engine). Just for clarification.

 

Hmm... Gonna try this, just for giggles

 

Aaand I deliver!

The sound is 100x times better than with the silencer on, but it could get somewhat too loud sometimes. The general extra grunt is nice tho.
Drive-by video: (I thought I recorded a video of it standing still with sound test, but I forgot to hit record.. Might bother to make one later)

 

Thats sounds like the 390 mate, try watching a 390 vid on youtube while you have your video playing you'll hear what I mean.

While Im typing I will say I agree with Doctor Lew regarding pressures etc. the can does more than silence things and is part of the final output. It may feel revier down low but Id be comfortable putting my money down to say it will drop in HP/torque on a Dyno. Thats why you all buy an Akra. Hahaha another one for Kev . Maybe we need to start a Kev R&D Slush Fund!

 

I doubt the 390 is this loud out of the box (video might have captured it badly, but it's looud when driving ), but yup I can see the similarities

I didn't feel much difference in power, but if my memory is serving me right, I had 80km/h in 3rd gear at a lower rpm now than before.

 

Sounds great sneaky. Do you have any other mods on it?

I will do the same to mine this weekend. I need better sound. I asked Kevin if I had to remap if I removed the cat and put an akra can on it and he said no. His testing showed that it will work fine. So I am sure that having just the cat will be ok too.

 

You could make a exhaust protection "pad", like TheHaughom did:

 

You could make a exhaust protection "pad", like TheHaughom did:

Just remember to do it BEFORE you're surfing on the tarmac. Guess how I know... :death:

 

Here's that onboard sound video I promised:
braaaap

 

Sounds good. Nice roads and scenery you have there.

 

I have been riding with out the silencer for about 6K miles stock map with it set to Map2 on the dial to advance timings 6K since I got the bike and so far nothing has happened to the bike. Like I said I only have a little over 6K on the bike since I just got it beginning of last month late July but will keep everything posted if I have issues. I do hear back fires when letting off the throttle and just letting the bike slow its self down and pulling in the clutch but other then that its great. Some people dont like how loud it is but to me people on the freeway since I spend 90% of my time on they can hear me just fine.

 

Yup had the same experiences A little backfire when letting go of the throttle and letting it engine brake.
Also got alot of looks because of it's loudness