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General Category >> Rubber Side Down! >> New Cobra Exhaust
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Message started by SoC on 10/19/19 at 15:26:55

Title: New Cobra Exhaust
Post by SoC on 10/19/19 at 15:26:55

Finally got around to installing the Cobra slash-cut muffler I purchased a year ago. It's a straight up fit if you mount it as a side exit, but loud as hell and sounds a lot of rat-tat-tat (lawn mowery). I wanted a more down turn look, so I fabricated an adaptor from header to muffler and a stainless monuting plate for suspending it from the original attachment for the stock muffler.

To quiet it and add some depth to the sound placed an additional baffle at exit end of the adaptor which runs into the cavity of the muffler. Quieter and deeper sounding but still loud enough to get a car drivers attention when your in their vacinity.

Also added the new leather a seats.

Title: Re: New Cobra Exhaust
Post by SoC on 10/19/19 at 15:28:17

The adaptor.

Title: Re: New Cobra Exhaust
Post by SoC on 10/19/19 at 15:28:56

The hanger.

Title: Re: New Cobra Exhaust
Post by Mavigogun on 10/19/19 at 15:54:59

Did you fabricatevthat hanger?

Title: Re: New Cobra Exhaust
Post by SoC on 10/19/19 at 21:11:38

Mavigogun, I did fab the hanger. I have stainless blanks available, and all the layout specs, they do need bent. There is some additional work, they ultilize 2 stainless carriage bolts, with heads ground down flat (possibly could sub elevator bolts). Adaptor from header to muffler is the bigger fab, but not too complicated. It has a bad ass sound now, I can only describe it as "Savage".

Did about 50 miles on it so far, on an open run up an interstate, it pulled better up to 65, then previous exhaust, and that's where I hold it in general. Blasts to 75 where acceptable. Been riding the newer 2011 for the past month so I am a little out of touch with how the older felt. hadn't riden it since July. There's a whole different dyanmic with the buckhorns on the old and the drag bars on the new and how it feels on the big road. Would be interested on feedback about that from those who have experienced both configurations.

So far I'm happy with it, but it is a little loud. It does though now have a sort of low grumble, dare I say Harleyisc, is there a spelling for that? One issue may be the front baffle is venting (via the blockage) a lot of hot gas out of the header at the front of the muffler which in a 20 mile initial ride had some heat issues in the chrome of the Cobra. With longer runs it may just all go away in the wash.

With a better placed, solid chrome, no holes shield, I think it would have a look that flows even better along the pipe. Anyway, I have blanks for the hanger, extra bent and cut apater pipes from the header, and the extra baffle is a Highway Hawk part. I does require some shim spacers and tooling.