I  just opened the box of a two brothers pipe !!I pulled the Factory pipe and looked inside the header and saw The cats inside an easy job to cut them out. However there is a o2 sensor right past the cats, The Question is can I cut them out without problems? Will I get a FI Light?

If they are the older type ceramic cat.s, they are going to really resist and you will have to work them pretty good to get rid of them. Someone came up with a work- around that was basically cutting a piece out of the header and then welding a new piece of tubing, all to avoid having to 'smash' the cat.s out in the first place.

I am not sure if you will get an error but a couple of people have actually done dyno. testing before and after removing the cat.s and there was no appreciable gain in power. So I would wonder, why remove them in the first place?

Brian

I  just opened the box of a two brothers pipe !!I pulled the Factory pipe and looked inside the header and saw The cats inside an easy job to cut them out. However there is a o2 sensor right past the cats, The Question is can I cut them out without problems? Will I get a FI Light?

This topic has been covered before and the conclusion was that it was pretty much a waste of time removing the one-way catalytic convertors on a C14.  They are not restrictive.  Probably won't get an error, but there are much better ways to spend your time

This topic has been covered before and the conclusion was that it was pretty much a waste of time removing the one-way catalytic convertors on a C14.  They are not restrictive.  Probably won't get an error, but there are much better ways to spend your time

I also, will ask why trash a brand new aftermarket header, before you try it out?

As noted no real benefits come from removing it, and as you have a new bike, it does require the inputs from the o2 sensors to correctly supply fuel, without getting errors..
If you decide to mess with stuff, might wanna talk to SISF about a reflash, and deal with it in that manner..

I also, will ask why trash a brand new aftermarket header, before you try it out?

As noted no real benefits come from removing it, and as you have a new bike, it does require the inputs from the o2 sensors to correctly supply fuel, without getting errors..
If you decide to mess with stuff, might wanna talk to SISF about a reflash, and deal with it in that manner..

+1
If one is looking for power and responsiveness, no better money can be spent.  Plus it is easy.

So where is this PROOF of cat removal not having any effect?

Where is this thread ?

Steve want's me to bring my bike to him for dyno time to help resolve this ah misconception

My butt dyno said there was a difference , but I also installed Two Brothers cans at the same time...

I was surprised how much restriction those two cats LOOK to create,  I guess if one kept the stock muffler

The restriction would still be substantial  and not change much.

Steve has said ANY restriction of the exhaust restricts HP

So where is this PROOF of cat removal not having any effect?

Where is this thread ?

there was actually a test done on that [...] The great news is that he had the bike dyno'd before and after so we know the results: he gained one (1) Hp. Maybe. [...]The Catalytic converter takes up almost no room in the exhaust and presents virtually no restriction.

Steve want's me to bring my bike to him for dyno time to help resolve this ah misconception

The only real proof would be changing a single variable on the stock exhaust system and having a dyno done before and after.

My butt dyno said there was a difference , but I also installed Two Brothers cans at the same time...

Placebo is a powerful thing.  It has fooled me more than a few times.  For most people loud = fast and powerful.

I was surprised how much restriction those two cats LOOK to create,  I guess if one kept the stock muffler The restriction would still be substantial  and not change much.

That is true, but the stock muffler is not much restriction either.  That has also been proven with dynos before and after.

Steve has said ANY restriction of the exhaust restricts HP

Restriction is like water pressure and electricity, it is the single point of most restriction that restricts everything.  The entire C14 system was designed together, and designed well.  No replacing any one part of the stock exhaust system makes much difference.... you have to replace everything.

I cannot point to the thread, in fact, it may be gone. Long time ago there was a gentleman, I think perhaps Flying Kaw, who did a dyno test on his bike, then removed the cats, then dyno'd the bike again and if memory serves, gained one Hp. The problem is that two different dyno. tests on two different days will always yield some differences, and one Hp is well w/in that variance so I am taking this information and making the statement that 'it does not make any difference'.

In any event, not my intent or interest in arguing with anyone about this, and of course you (and everyone else) is free to do whatever you want. Besides that, if you remove the cats. and believe it makes the bike better in any way then I suppose the removal really did work....

Brian

So where is this PROOF of cat removal not having any effect?

Where is this thread ?

Steve want's me to bring my bike to him for dyno time to help resolve this ah misconception

My butt dyno said there was a difference , but I also installed Two Brothers cans at the same time...

I was surprised how much restriction those two cats LOOK to create,  I guess if one kept the stock muffler

The restriction would still be substantial  and not change much.

Steve has said ANY restriction of the exhaust restricts HP

Front tire seamed to want to fly more,  stays up little longer on 1 to 2 shift

I used a 08 ZX 14 header also  so I could make it a dual set up.

Folks on the other board are doing some tests on exhaust with Steve

Me thinks Steve might develop his own system ...

 

I cannot point to the thread, in fact, it may be gone. Long time ago there was a gentleman, I think perhaps Flying Kaw, who did a dyno test on his bike, then removed the cats, then dyno'd the bike again and if memory serves, gained one Hp.

Brian

+1. This is true. Cody did this, and I was there.
Cody pretty much tried everything you could try for power.
Bob

+1. This is true. Cody did this, and I was there.
Cody pretty much tried everything you could try for power.
Bob

Everything?

http://suchen.mobile.de/fahrzeuge/details.html?id=226463194

I have an '09 with the Cats removed and a Two Bros slip on. SISF built the pipe. There is a very slight HP gain like 2hp. The biggest advantage is the loss of all that heat. They act as two large heat sinks right under you. The bike is so much cooler now, I removed the aftermarket heat shields. I live in FL and in August its effing HOT! With his Evo flash I dyno'd at 148HP with the two bros noise re-stricter removed. She tops out at 156-160 then falls flat. I could probably get another 10mph or with the noise re-stricter removed, but that is more than fast enough for me. I believe the heat issue was solved on subsequent model years.

I have an '09 with the Cats removed[...]The biggest advantage is the loss of all that heat.

Hmm, interesting point I hadn't thought about.  That is part of its function is to use heat to burn off unburned fuel... and that will create additional heat and concentrate existing heat.

She tops out at 156-160 then falls flat. I could probably get another 10mph

Wow, and to think I have never been more than 120... and that was freaking too fast for me!

I believe the heat issue was solved on subsequent model years.

I wouldn't say it was "solved", when it is hot outside and you are sitting at a light, it can still get pretty darn hot.  The new fairings do work better to throw the heat off the rider better, and it has heat shields on the exhaust pipe.  When moving at a reasonable speed, the 2nd gen does a good job of heat management.  I just wish the radiator fans ran in reverse when at a stop.  THAT would get a lot of heat away from the rider.

1st gen isn't hot at speed, Max.  At least mine isn't.  The problem was in stop and go traffic.  It's better now that I have it insulated.

Well when it's 98 out in August. Even at speed its HOT! That being said the C-14 is still a lot cooler than my C-10 ever was. Especially in stop and go traffic.