Inside Diameter of Cobra Swpet Exhaust???

BigJohn141 said:

Does anyone know the inside diameter of the Cobra swept exhaust by chance? I dont have a set of calipers here and pulling the baffles and measuring them would be a lot of work. From the best I can tell they LOOK to be 2 1/8" ID but would like to know for sure. I am thinking about ordering a set of Big City Thunder Baffles and trying them out, they are suppose to give a deeper sound but still not be as loud as no baffles at all.

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The outside diameter of the baffle is 2 1/16" and I would imagine the inside diameter of the pipe itself would be 2 1/8"

Thank you very much Dave. I am going to order some and give them a shot.

BigJohn141 said:

Thank you very much Dave. I am going to order some and give them a shot.

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Big John, I would be interested in knowing how you make out with them and how they sound. Give us an update as to how they sound once you get them in.

BigJohn141 said:

Well they are all but done. I just have to head over to a friend's house to use a slide hammer and a metric tape for a new screw hole. I should have sound results after while.

All tack welded up, at a slight angle to help with install...

Inside shot, the smooth shoulder side will go in first...

EDIT: Slight problem, I think I might have ovaled them slightly when I had them in the vise. I am going to do a little adjusting on them tomorrow so they will fit. Results will follow.

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Try heating them up to get them back into shape then slip them in. They might be a bitch getting back out but they can't be any worst than the stock ones. I have a hole in my garage window now where I threw one of those F&%king banana baffles threw it when I finally got it out. WTF did they really have to design it like that?

mr flathead would ticket me for those,but they look good.

460brevill said:

mr flathead would ticket me for those,but they look good.

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After viewing them I'm not sure how you can get any decent sound with that configurations, maybe the two reducers in size makes a good a waffle effect and make a good sound. Curious to hear what they sound like.

Well hopefully I will get them finished up and installed today. I am pretty curious myself to see how they sound but if it is bad it was only $13.

Well its finished!!! I must say it is not quite as loud as no baffles but getting close. It does have a nice low mean tone to the exhaust that you can feel in your chest at idle now and in my opinion sounds damn good. They were a pain to install because even with getting them round again and grinding down some more, they were still a super tight fit and there isnt much of a lip to get in there to drive them in. I found part of a tool that was just larger then the inside reducer and got them in, I need to back them out about 1/2" cause I went a little far for my screw holes to line up. I will say that if I do decide to remove them, it will be a bit of work. I took a video of the modified cobra baffles and I will make a video of these to compare it too later. All in all I am pleased with my $13 baffles.

I stopped by a gas station just a little bit ago after I got off work and there was a guy on a Harley getting gas also, he came over and checked out the Fury and asked if the pipes were stock on it. I told him they were aftermarket but had homemade baffles in them and he said it sounded really good, real throaty and not poppy like others, he said he really liked the way it sounded. +1 so far...

If I get off work early enough tomorrow I will try to get a video of it at idle and maybe a drive by or two.

Hey Big John, your baffle project sound great. I've been playing around with a few baffle ideas of my own since the weekend is filled with rain and nothing else to do. I came up with a a couple of different variations for the cobra swept pipes using the existing cobra baffles by cutting them and modifying. The best sound I've found is by cutting and using the first 4 inches of the existing cobra baffles. I drilled one 3/8'' center hole and taped it out to accommodate a ft long piece of threaded rod to help with alignment purpose for easy install. I sanding the baffle diameter down slightly and they slide in and out very easy and with the help of the threaded rod you can line up your bolt holes is seconds tight them in and then unscrew and remove the threaded rod for total install time of under a minute. I'll have to post up some photos up once I'm able to verify the new sound with a test drive for anyone else who wants to hack around on a rainy day.

Just curious the point of these Thunder Baffles versus no baffles.

Is this to avoid a ticket should you get pulled over?

'Cause I'm thinking any baffle is going to be less thunderous than no baffles at all. And, I'm really diggin' the sound of my Cobra Swepts w/o their baffles.

Some states require baffles and some don't. These are not thunder baffles but a simular homemade version. I personally think the no baffles are just loud and don't really have a tone to them and these baffles quite them down a little and add a deep tone too the pipes. The slight increase in back pressure can improve performance over straight exhaust but it would be a very small amount. If you are happy with the sound of straight exhaust and your state doesn't require baffles then this would probably be a waste of time for you.

BigJohn141 said:

Will do Dave. I am going to try a little $13 setup first that I saw while researching them.

Here is what a Monster Bffle looks like...

Here is what I am going to try...

We will see how they turn out shortly.

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GOOD JOB! i wish i had the know how to do that!
i was looking at the monster baffle and is it me or is there also something in the baffle? look at the right side and in the tube, there is something in it.
I am sure it also changes the sound and back pressure.
Thunder city claims that you will get better peformance and louder deeper sound then you would with the stock cobra baffle.
I would go with no baffle but you loose peformance that way. This seems to be the best way to go.

BigJohn141 said:

Some states require baffles and some don't. These are not thunder baffles but a simular homemade version. I personally think the no baffles are just loud and don't really have a tone to them and these baffles quite them down a little and add a deep tone too the pipes. The slight increase in back pressure can improve performance over straight exhaust but it would be a very small amount. If you are happy with the sound of straight exhaust and your state doesn't require baffles then this would probably be a waste of time for you.

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Thanks for the details. If I get pulled over, I'm just gonna saw the original baffles in half, bore out the end baffle wall and insert it back in. I'm sure that would suffice to stop the "night stick test."

mrbyber said:

GOOD JOB! i wish i had the know how to do that!
i was looking at the monster baffle and is it me or is there also something in the baffle? look at the right side and in the tube, there is something in it.
I am sure it also changes the sound and back pressure.
Thunder city claims that you will get better peformance and louder deeper sound then you would with the stock cobra baffle.
I would go with no baffle but you loose peformance that way. This seems to be the best way to go.

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Yeah I saw that and coundnt really figure out what it was. It might be something to up the backpressure or it could just be a little bar to help with install and removal. IDK?