Akrapovic RT Exhaust - Dyno & Cat Removal Questions

[retired1]

I don't have any facts but I would bet that the bike would be to lean for comfort if we remove both without a tuning device. As of right now I can not find anyone offering a tuner for the 2013 yet. For the best performance I think we need to remove the cat, add free flowing muffler, and remove factory airbox and install the Kewl Metal high flow intake system. With the 50lbs of weight reduction and the more air in and more air out we should be able to get some good gains! After that there isn't anything else let on the aftermarket to improve performance. You would think that after 6 years we would have cam options, big bore kits, and several high flow intake options with cool air intake ducting to foglight holes.

I don't know how you would find it, but back in '09 or '10 there was a big bore kit available for the 990.

 

[Bob Denman]

These engines are pretty much "locked-down" by their computers...:yikes:
Are you referring to the Aprilia pieces?
They might bolt on; but your talking about engine bits designed to work in a fullblown 400 pound sportbike; not a 700 pounder... :shocked:
You need a different powerband for our application... :gaah:

 

[stewartj239]

I think what he is saying is that removing the cat would have more affect on the A/F mixture than removing the muffler, which I agree. Are you saying you have seen post where people removed the cat and nothing else and did not use a fuel controller of any kind with good results?

Yes. The stock ECM will handle the removal of the cat. Once you swap it out, you let the bike idle for 10-15 minutes and it will adjust. I can provide links to some threads on this forum that already cover this. It is a true bolt-on modification.

From what I've read, the ECM can handle and adjust up to a 20% change. That's why I'm wondering if doing the exhaust (in addition to the cat removal) - primarily with the Akrapovic, will put it over the 20% where the stock ECM won't be able to adjust.

 

[stewartj239]

Im at a bit of a loss as to the cost of some of these mods...especially exhaust. $450 for 12 inches of exhaust tubing..(another $40 for gaskets!)
Am I missing something here?

WHy is a simple cat bypass that I can have done on my Toyota at any quality custom exhaust shop about $100...put it under my Spyder and suddenly its worth almost $500???

Funny. This topic was covered as well. Some people have done this themselves for well under $200, but those who have bought and installed the kit have said that they they can kind of understand the price after seeing how tight some of the clearances are in there and how everything needs to align / match up perfectly.

 

[SNOOPY]

Thats good news! I just hope they do a map for a muffler swap only, a map for muffler swap and high flow intake, and a map for muffler swap, cat removal, and high flow intake install. With the 2012 the cat was in the muffler so when you swapped it out you removed the cat at the same time. It would only be fair that they gave us a map for the cat removed as well.ray:

Interesting that the 2012's had cat and muffler combined and people changed out the exhaust. W no issues. That almost tells me that you can change the cat and muffler on the 2013's w no issues.

almost lol

 

[SNOOPY]

Im at a bit of a loss as to the cost of some of these mods...especially exhaust. $450 for 12 inches of exhaust tubing..(another $40 for gaskets!)
Am I missing something here?

WHy is a simple cat bypass that I can have done on my Toyota at any quality custom exhaust shop about $100...put it under my Spyder and suddenly its worth almost $500???

Welcome me to the world of powersports. Nice to meet you. :roflblack:

 

[stewartj239]

Interesting that the 2012's had cat and muffler combined and people changed out the exhaust. W no issues. That almost tells me that you can change the cat and muffler on the 2013's w no issues.

almost lol

I think he was talking about the RS where the cat was in the muffler. I believe the RT has always had it prior to the muffler. Either way, your point is valid. The Akrapovic exhaust in that scenario would be replacing them both.

 

[SNOOPY]

I think he was talking about the RS where the cat was in the muffler. I believe the RT has always had it prior to the muffler. Either way, your point is valid. The Akrapovic exhaust in that scenario would be replacing them both.

Yeah, wasn't sure about the RTs. Everything I've read about the last couple years of RS's and ST's show them also having many interchangeable parts. Not so much the RTs

 

[Bob Denman]

The RS and ST bikes are a lot like brothers; the RT is a bit more like a first cousin.

 

[SNOOPY]

The RS and ST bikes are a lot like brothers; the RT is a bit more like a first cousin.

I thought it it was like an overweight father. :roflblack:



No offense meant lol

 

[Bob Denman]

:roflblack: you may be right! :roflblack:

 

[dizzyspots]

2012 RT still under warranty...will pulling the cat or adding aftermarket exhaust void BRP or extended warranty??

 

[stewartj239]

2012 RT still under warranty...will pulling the cat or adding aftermarket exhaust void BRP or extended warranty??

BRP sells the Akrapovic aftermarket exhaust right out of their accessories catalog, so I can't imagine that any aftermarket exhaust would void the warranty. As far as the cat goes, if it does, then just put it back on before taking it in for repair

 

[quickster47]

I've not heard one myself but from what I've read the OEM muffler has a mucho better sound if you remove the catalytic converter.

Carl

 

[3 Wheel Addict]

How does removing "anything" after the o2 sensor make a difference in the engine as far as being lean or rich? The o2 sensor is in the head pipe and there is none after the cat (which really surprises me) so any changes after the o2 sensor really should not make any difference. Now unless the factory put that o2 sensor in there for tuning and its not used for operation, but it's a heated sensor and that means its active at idle.

 

[Bob Denman]

2012 RT still under warranty...will pulling the cat or adding aftermarket exhaust void BRP or extended warranty??

Let's put it this way...
If your shocks go bad, or your handlebar grips fall off; no.
If you suffer engine damage ? :dontknow: :shocked:

Do you think that they're NOT going to try and use it to keep from paying for an engine? :roflblack:

 

[SNOOPY]

Let's put it this way...
If your shocks go bad, or your handlebar grips fall off; no.
If you suffer engine damage ? :dontknow: :shocked:

Do you think that they're NOT going to try and use it to keep from paying for an engine? :roflblack:

Very good points indeed. :thumbup:

 

[SNOOPY]

How does removing "anything" after the o2 sensor make a difference in the engine as far as being lean or rich? The o2 sensor is in the head pipe and there is none after the cat (which really surprises me) so any changes after the o2 sensor really should not make any difference. Now unless the factory put that o2 sensor in there for tuning and its not used for operation, but it's a heated sensor and that means its active at idle.

Very good point.

I think replacing the muffler and cat w/ less restrictive "may" be harmful as in relieving possible needed back pressure?

 

[stewartj239]

Very good point.

I think replacing the muffler and cat w/ less restrictive "may" be harmful as in relieving possible needed back pressure?

But isn't that the benefit of EFI? Won't it automatically adjust to the changes (within reason). With a carbed engine, you'd just rejet. These types of changes are common.

 

[SNOOPY]

But isn't that the benefit of EFI? Won't it automatically adjust to the changes (within reason). With a carbed engine, you'd just rejet. These types of changes are common.

I'm old, I know how to rejet a carb. lol


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