Decatting the TE511 Muffler...

Do we know if the Akro slip on muffler provided with the bikes here in Australia have catalytic converters in them?

Got any more pictures of the internal baffles? I may want to shorten and decat my pipe soon as the bike gets here...

Did this today....exhaust sounds tinny and metallic sounding. Not smoothe and deep. Unless I dropped a rivet in the middle of the can or something.

By the way this is a super pain in the ass. If you decat + remove the spark arrestor, the exhaust is as loud as any bike I have had with a loud slip on. With the SA in it sounds a bit louder and throatier than stock.

I have a fmf slip on on the way so figured id experiment. Also back to back runs the spark arrestor did not seem to take much if any power away. But the bike is way louder! I am leaving the SA in.

The stock 511 sounds like gardening equipment.

After a long ride yesterday I can definitely say there was huge top end power gains.

Do you have map3?

Map 2 only. I ordered a pc v and auto tune. I would love to send the ecu in to get map 3 but cant do the downtime quite yet.

Nice to have all three, if there is an issue in the pcv, it automatically reverts to stock ecu programming.

hmmm. Once I get my front wheel changed on my ducati, I will be on it, so plenty of time to modify the te

Thanks for working all this out for us.

I finally did mine yesterday. I used the sawzall to cut the welds off the thin shield. After pulling the shield away, it's much easier to just cut through the first layer all the way around. Just cut right in front of the weld bead. Don't try to cut through the cat. It's a separate tube assembly, so you really only have to cut through one layer of metal not two. Once I cut all the way around, the cat tube just fell out as one piece.



I haven't had a chance to take my bike out yet but I can only guess it will have better roll-on and high end. It still sounds great with a slightly deeper rumble at idle. I would guess the cat is a quarter to a third of the total weight of the pipe.

Just did mine today, holy cow how time consuming. I do love how it has a deeper sound now without being louder over all.

I did this before getting a fmf slip on. The fmf is ridiculously loud, but the power gains are serious. Hard balance.

Hey, for the guys that cut them out with a zip saw (the direction I am heading), what TPI did you find worked best?

All I had were cheapy Harbor Tools blades, so I ordered up some quality extended life blades (Bosch I think) that were bimetal from 16-24 TPI. I dotn have a ton of metals cutting experiences, so not sure if there is any finesss or if I just grab a blade and go at it! Ie do I have a helper cool with some WD-40 and treat it like drilling?

I think the only metal I have zipped in the past is rebar. Any other cutting I did with a torch and there is no way I can do this cut with the torch.

I just left the housing in and hollowed out the converter. Others have stated there is more weight to lose if you remove the housing but I simply broke the insides out and filed it clean inside.

So it is some kind of ceramic right? I have only seen the insides of catalysts for wood stoves - never the inside of an automotive although I assume the process is quite similar.

Not that this has stopped me in the past, but have any third nipples appeared as of yet? I am guessing the materials in the catalyst are not stuff one finds at Wal-mart...

I used a great big 3/4" or bigger wood drill bit then a flat screw driver to break it up and pry it away from the edges. Long, long process no doubt but it became very smooth after a wire wheel on a Dremel to clean out in inside diameter of the pipe. The insides are a kind of aluminium honeycomb coated in ceramic, looks just like a smaller metallic wasp nest. No third nipples but I do pee my pants when the microwave turns on "cousin Eddie"

Rather than going to the trouble of de-catting the oem big can muffler, I think a better option is to add baffles to an inexpensive silencer like the powercore4 and shed 5lbs of high center of gravity weight. Baffles such as half mood shaped wedges can be easily welded into the silencer at alternate angles as well as a smaller diameter insert. There is always a compromise between output power and noise. The big can is heavy and stifles the power considerably.