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[jimcb1]

how hard is it to change stock header to a catless header on a 2014 ultra cvo, any special tools

[Boatman]

A shop that does it all the time probably takes 1-1.5 hours.  Me being slow took 4 on my 2014..  The O2 sensors are metric.  Everything else you should have in your toolbox..  It's not hard, just anytime you mess with exhaust it can be a PIA..  I used my stock exhaust gaskets over with the Fullsac DX headpipe but you will probably use fuelmotos gaskets with their headpipe.  Not a lot of room getting to the front pipe nuts but can get their with a combination of 1/4" drive short/long sockets and short/long extensions.

[jimcb1]

thanks I know everything looks  tight

[Boatman]

I did mine with 110 miles on the bike.  The mufflers came off hard.  The headpipe nuts came off easy.  The carriage bolt next to the tranny was easier with a air wrench.  I put the heat shields back on after the pipes were installed.   I finger snugged the 4 header nuts, then pushed pipe towards engine at trans mount and tightened that carriage bolt and then torqued the 4 nuts for the headpipes per manual.

Also, tighten (check tightness) of the  tranny clutch trap door cover  bolts near the exhaust bracket that you can't get to easily while the exhaust is on and have leaked overtime for some.

[mark]

There's a retaining clip on the end of the header at the cylinder that can be hard to get on the new header.  Seems like I used snap ring pliers to open them up.  Here's some tips:

1. Wipe down the new header with alcohol after you have it in place.  It'll keep you from burning in fingerprints when it gets hot. 
2.  Mark the O2 sensors so you know which one goes where.
3.  Put a little anti seize lube on the 02 sensors before you screw them into the new header.
4.  Put a little anti seize lube inside the muffler inlet.  It'll make taking off the mufflers easier in the future.
5.  You may find a strap wrench and some WD 40 will help get the mufflers off. 
6.  As was previously mentioned, put the heat shields back on after everything is assembled and leave them loose until each piece has been put on.  Don't over tighten the heat shield hose clamps.
7.  I was unable to get my torque wrench on all 4 nuts on the cylinder, so I had to estimate. 
8.  I used new header gaskets.  Some say you can reuse the old ones, but what a pain it would be to have an exhaust leak and have to disassemble everything. 
9. There is a torque sequence on the header nuts, but I don't recall.  You can probably Google it.