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Discussion starter · #81 ·
Hey tony, very informative thread! Thanks for posting all this info.

Noob question: is that the cat on the stock icon exhaust attached to the muffler and not part of the header? The reason why I ask is I don't see the cat in the pictures (don't have my bike yet) and I plan on only getting a slip on competition werkes exhaust, bmc air filter, and rexxer user unit as fat as performance mods go. Trying to find out if I have to swap out the header as well to eliminate the cat.

Thanks!


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CAT is part of stock muffler and takes up the space directly under the swingarm. Take a look at your bike, you will see what I mean.

Fitting an aftermarket can will eliminate the CAT (unless your can of choice has its own CAT, a select few do).

It is very important to remap if the CAT is being eliminated (and beneficial even if it is not).

Adding power will always come with a decrease in fuel economy, as stated any percentage in gains will show a corresponding decrease in mpg percentage (roughly).

Example, adding 5% more power one should expect an equivalent reduction in fuel economy (roughly 5%).

There is no such thing as "free lunch".


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CAT is part of stock muffler and takes up the space directly under the swingarm. Take a look at your bike, you will see what I mean.

Fitting an aftermarket can will eliminate the CAT (unless your can of choice has its own CAT, a select few do).

It is very important to remap if the CAT is being eliminated (and beneficial even if it is not).

Adding power will always come with a decrease in fuel economy, as stated any percentage in gains will show a corresponding decrease in mpg percentage (roughly).

Example, adding 5% more power one should expect an equivalent reduction in fuel economy (roughly 5%).

There is no such thing as "free lunch".


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Nice. Thanks for the explanation. I'm just glad that I don't have to buy an aftermarket header but can instead just buy an aftermarket slip on in order to eliminate the cat.

Most likely going to go this exhaust route with the Rexxer.

Kind of off topic but I was trying to find the BMC air filter that so many people seem to replace the stock one with, but didn't have much luck searching. Is it just a drop in air filter replacement? Any modifications needed to the air box?

Thanks again!


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It is a drop in replacement, no mods needed. I bought mine via eBay (Italy).


According to Rexxer, it does not do a lot in terms of output - apparently +1 HP on top end and -1 HP in the midrange, but it is more durable and should sound better. I still need to install mide and will do so as I am waiting for my remapped ECU to return from Rexxer.
 
Discussion starter · #84 ·
Nice. Thanks for the explanation. I'm just glad that I don't have to buy an aftermarket header but can instead just buy an aftermarket slip on in order to eliminate the cat.

Most likely going to go this exhaust route with the Rexxer.

Kind of off topic but I was trying to find the BMC air filter that so many people seem to replace the stock one with, but didn't have much luck searching. Is it just a drop in air filter replacement? Any modifications needed to the air box?

Thanks again!


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Drop in replacement...

Part # is fm452/08


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Thanks, guys. One last question (for now). The Rexxer unit can clear service warnings, correct? So no need to depend on the dealer to clear the 600 mi and 7500 mile service interval warnings for you?

That's honestly one of the biggest reasons why I want the User unit instead of sending my ECU in to get it flashed.

thanks!


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Thanks, guys. One last question (for now). The Rexxer unit can clear service warnings, correct? So no need to depend on the dealer to clear the 600 mi and 7500 mile service interval warnings for you?

That's honestly one of the biggest reasons why I want the User unit instead of sending my ECU in to get it flashed.

thanks!


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That is correct.
 
Hi, just got my ECU back from Rexxer! As I have opted for the O2 sensors to be disconnected, the mention that you need to disconnect the sensors on the bike. Did you just disconnect the connectors of the O2 sensors or is there another way?


Otto
 
Discussion starter · #88 ·
Hi, just got my ECU back from Rexxer! As I have opted for the O2 sensors to be disconnected, the mention that you need to disconnect the sensors on the bike. Did you just disconnect the connectors of the O2 sensors or is there another way?


Otto
2 ways this can be done.

The first, and easiest, is just to disconnect each of the 2 sensors at each connector. The connectors are located about a foot "up-stream" from each sensor (just follow the wires).

The second, cleaner - IMO, is to also remove the sensors themselves from the header pipes. This will preserve the integrity of the sensors, ensuring that they can be installed again at a later time, if desired. If you do this, you will need a couple of M18 x 1.5 "plugs" - here is a link for these...

Stainless Steel O2 Oxygen Sensor Plug Cap M18X1 5mm Hex Bung | eBay

It is important to do this work BEFORE reinstalling the ECU.
 
Tony, I'm just curious if the the Rexxer ref lash will be very obvious to the Ducati Dealer when I take my bike to have the regular service done. And if so, if we're to buy the Rexxer with the user kit and return it to OEM prior to service, would the Ducati Dealer know the ECU was flashed?
 
Discussion starter · #92 ·
Tony, I'm just curious if the the Rexxer ref lash will be very obvious to the Ducati Dealer when I take my bike to have the regular service done. And if so, if we're to buy the Rexxer with the user kit and return it to OEM prior to service, would the Ducati Dealer know the ECU was flashed?
Nope, to the dealer it will look just like the Termi Race Map, as all they can see is "RACE" on the dash upon startup.

If you have a REXXER unit, you can reload the stock mapping prior to service and they will be no wiser.
 
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Thank you Tony.

Side note.. After extensive and careful thought I truly believe all your mods are the most beneficial and practical for me. I'm waiting for my 16T sprocket and Tutoro oil chained to arrive :) last will be upgrading my suspension.
 
ROI?
For those not looking for performance, $300 gets you a bike that is actually fueled properly, eliminating the "snatchiness" and low speed stumbling so many have complained about (I'm not is this camp). Plus the bike runs cooler and will be more reliable - long term.
Tony, two more questions.

with the ZARD low mount i truly feel that my bike is less hot, is it only my impression? I haven't touched anything. else.

I'm also not planning to remap my ECU with Rexxer. I will reset the ECU and, as you said, it will still run lean, fair enough but, will the lean run damage my engine somehow? the original map is programmed to run lean anyway so it shouldn't damage the engine, right?

great thread thanks for all these info buddy.
 
Discussion starter · #95 ·
Tony, two more questions.

with the ZARD low mount i truly feel that my bike is less hot, is it only my impression? I haven't touched anything. else.

I'm also not planning to remap my ECU with Rexxer. I will reset the ECU and, as you said, it will still run lean, fair enough but, will the lean run damage my engine somehow? the original map is programmed to run lean anyway so it shouldn't damage the engine, right?

great thread thanks for all these info buddy.

If you didn't alter the fueling, it's not running any cooler - that's for sure.

Running lean will have negative effects on both performance and longevity, but I'm not saying you will cause immediate damage.


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I don't think the motor is running any cooler. The exhaust defiantly feels cooler since removing the cat. The way I understand a cat works is based on heat it needs heat to burn off any emissions.
It feels cooler on my right leg. I noticed this on my R1 when I removed the cat also.
 
Discussion starter · #97 · (Edited)
I don't think the motor is running any cooler. The exhaust defiantly feels cooler since removing the cat. The way I understand a cat works is based on heat it needs heat to burn off any emissions.
It feels cooler on my right leg. I noticed this on my R1 when I removed the cat also.
Removing the CAT (without altering fueling) actually raises exhaust temps.

If you remove the CAT it leans out the mixture - leaner equals hotter.

The CAT is a "passive" device, there is nothing about it that alters exhaust temps, only the ECU can do that - in conjunction with the O2 sensors and SAI - by metering more or less fuel. The ECU gets no feedback from the CAT (in terms of heat - or anything else for that matter). The only feedback from the exhaust system comes from the O2 sensors, which are positioned in front of the CAT within the system.
 
Could it maybe be caused by the fact that the stock exhaust is massive and contains more metal to provide heat? My Virex slip on is kilo's lighter than stock and much smaller as well, which could result in less heat traveling upwards when you are waiting for a traffic light.
 
My newly installed Termi is also much less hot than the stock exhaust. I can actually touch it right after a ride with my bare hands. The engine temp is the same though as far as I can tell.
 
Discussion starter · #100 ·
My newly installed Termi is also much less hot than the stock exhaust. I can actually touch it right after a ride with my bare hands. The engine temp is the same though as far as I can tell.
Heat in the exhaust headers and the temperature on the outside of a muffler are 2 different things...
 
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