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On the '10's the o2 sensors are down by the cat so removing it is rumoured to cause cross talk between them. I have removed the cat on 2 '09 SERG's and replaced mufflers. Tuned with TTS and both guys said bike ran better.
Perhaps true duals with O2 fittings will work. I see Vance and Hines has a set - but I'm gonig to wait to see how this all shakes out before I fork over $400.
If you are gutting the stock headpipe there could be some reversion between the headpipes, but we have not seen it. With our Jackpot headpipe we are not simply removing the cat, our pipe is very different including a completely different collector which in this case there are no issues with reversion affecting the O2 sensors on the 2010 bike which are in the stock location. For tuning purposes our headpipes also have 18MM bungs located near the exhaust ports which which accept wideband O2 sensors.
Are you planning on making pipes without the larger fittings? I'm not crazy about having superfluous holes in my pipes.
Are you planning on making pipes without the larger fittings? I'm not crazy about having superfluous holes in my pipes.
Our headpipes will have 2 sets of bungs which will give the guys with 2010 bikes options for tuning platforms, but most importantly the 18MM bungs will be there which allow wideband sensors to be installed in the pipe when dyno tuning. There will be stainless bung plugs which offer a very clean look for the ports no used.
I cut the cat. out of my 2010 Limited last night and let me tell you what.......It helped. There are no o2 sensors after the cat so the bike does not know if it is there or not. But the overall sound, bike temp and performance was well worth it. Easy to do if you are on a strict budget like me...
With all due respect, there's simply not a prayer that a header pipe with a cat is going to run cooler than the same head pipe without a cat. No way, no how. While we all want our engines to run cooler, if it means being uncomfortable for hours on end, its not worth it. If guys are tring to sell aftermarket heads with cats in them, its because someone from the EPA leaned on them. There is nothing about a cat that enables the engine to run stronger, pull quicker or use less fuel. Everything about a cat reduces the performance of an engine compared to the exact same exhaust design without a cat.
I have a 2010 SE Ultra. I ran it for 800 miles in stock form. It was very close to unbearable in terms of heat under my right thigh from the cat. Its absurd. The EPA knows its absurd. HD knows its absurd and now customers (after paying their hard earned $) are only now finding out how absurd it is to place a cat on these bikes. With EFI, the pollution level on these bikes is far less than a car even without a cat, yet all the PC nuttiness taken to extremes will soon have cats on our weedwackers.
It has to stop. I for one wasn't going to take it and had my head pipe sent to Fullsac to have it removed. Wow, what difference. In addition to tuning the bike, it now runs nice and cool. No heat on my leg...as it should have been from the start.
If you like the heat on your leg and enjoy losing power to the enviro nuts, just keep the exhaust as it is. If the heat bothers you, get the cat yanked or buy an aftermarket header without a cat. It was an easy call for me and one that I would do again without a doubt.
At last, a voice of reason. And common sense too. How refreshing. In order for Harley to keep passing the continuously more restrictive EPA requirements, water jackets are just around the corner. Unless they redesign the standard 45 degree crank engine and add water jackets and a pump, the 96" engine will soon be obsolete.
I didn't have a cat in my headers, because my 09 Ultra is a non-California model, but they were roasting my thighs and my passenger's right ankle in stop and go traffic. After trying about every solution on the market, such as PCV, oil cooler, richer maps etc ....... I decided to bite the bullet and mount true duals (V&H Dresser Duals). The difference is very noticeable. Not that I'm getting frost bites when I touch the headers now but they're definitely cooler than the stock ones.
I lost a little bit of torque in the low end but nothing that makes me regret the move.
If my stock headers had a cat, I would have yanked it immediately, before doing anything else.
I'd like to see an honest dyno test of swapping a 2009 california header pipe vs. a 2009 49-state header pipe, back to back on the same day. I'm guessing the peak difference is very close to that +/- 1hp as mentioned earlier in the thread. It'll sound better, but I'm sure it's not worth even remotely significant power gains. If you want to remove it for sound and heat, fine, but you really aren't losing performance because of the cat, especially on the mild engine builds everyone does here. On a 124" it's gonna make a larger difference, but a 96/103 with mild cams, the difference is negligable.
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