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Intake and Exhaust Intake and Exhaust Systems for Road Glides

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post #1 of 21 (permalink) Old 10-09-2018, 09:10 AM Thread Starter
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catalytic converter

Question for anyone who has removed their cat. or replaced a header without a cat. Does removing the cat increase the exhaust sound level even with stock mufflers? On my Freewheeler it has Jackpot 2-1-2-headers without the cat and the exhaust is LOUD.Is this normal?


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post #2 of 21 (permalink) Old 10-09-2018, 12:02 PM
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Depends on the bike. A Twinkie, definitely does. An M8, doesn't do squat. I gutted the stock header on both. Great sound on the 103. Nada on the M8.


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post #3 of 21 (permalink) Old 10-09-2018, 07:57 PM
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It made mine louder, especially when you roll on the throttle .
RGKen likes this.

2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
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post #4 of 21 (permalink) Old 10-09-2018, 08:17 PM
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Originally Posted by Dice21 View Post
Depends on the bike. A Twinkie, definitely does. An M8, doesn't do squat. I gutted the stock header on both. Great sound on the 103. Nada on the M8.
Yes this ^^^^^^^^


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post #5 of 21 (permalink) Old 10-22-2018, 03:12 PM
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Remove Cat

Whats the best way to remove the cat


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post #6 of 21 (permalink) Old 10-22-2018, 08:44 PM
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Originally Posted by Craig&Candy2013 View Post
Whats the best way to remove the cat
I don't know about best ,but I cut the pipe in half right in the middle of the cat. Then used a hole saw and carbide burr cutter to remove the rest on the inside of the pipe and welded it back together.
Others have cut a window out ,the size of the cat on the inside of the pipe.

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post #7 of 21 (permalink) Old 10-22-2018, 09:13 PM
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I cut the pipe in half. At the front of the cat. Basically where the factory weld is. Put it in a vise. Drill holes all aound down thru the cat (on the sides). Then use plyers and pull the center chunk out. Then chisel the sides smooth. Weld it back up. When it's on the bike with the heat shield. It's hard to notice the weld.

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post #8 of 21 (permalink) Old 10-26-2018, 11:12 AM
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You can also buy completely gutted headpipes on ebay for 150.00 I bought one they gutted it without cutting it don't know how but it was CLEAN. When I trade my bike cat pipe goes back on switch out new one.


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post #9 of 21 (permalink) Old 10-26-2018, 11:38 AM
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I haven't seen dyno #s lately, but from what I have read over the last two years, removing the cat does little to increase flow or add performance. What it does do is decrease heat and maybe improve sound. A lot depends on what else you have done to the bike.

Right now, my '17 RGS only has V&H HOs, stock headers with cat, stock air, and a warranty.
Runs and sounds great. Head temp a little elevated, not much, can't remember the #s. No backfires, popping, any of that.

At two years, gonna add a PV to richen up the fuel/air mix. May and add either a K&N or a Big Sucker, someday. Stock AF flows plenty of air for what I need.

John, Medina, TN - 2003 Honda ST1300 ABS, 2011 Kawasaki KLR 650, 2012 Ducati Monster 1100 EVO
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post #10 of 21 (permalink) Old 10-26-2018, 01:51 PM
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Agree I don't think it did much if any for sound but I did it for heat and it did help there and I'm running stage 2 cam and cannons


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