Hi there,
I've got an '84 FLHTC and enjoying it very much. lately i was told that putting an exhaust system (mufflers) will improve my ride and will also help the engine. currently it has two fish-tail pipes which is great, very loud and good looking. my questions are:
1. will the reccomendation above actually make a difference?
2. can i install the mufflers inside the pipes i already have?
3. what mufflers do you use? (looking for old-school nosy ones...)?
4. what about power cones? will they assist?

Thanx

 

1. will the recommendation above actually make a difference?

you have "straight pipes" straight pipes make good horsepower, but at the expense of torque.

- your pipes are proven to have increased power at 6000 rpms.

at the expense of power below 3000 rpms

- so the question is: what rpm range do you ride?

Most of use are below 4000 rpms 95% of the time, and desire torque at low rpms to help get started from a stop, accelerate quickly and carve through twisty canyon roads




2. can i install the mufflers inside the pipes i already have?

I don't think so


3. what mufflers do you use? (looking for old-school nosy ones...)?

I use supertrapps- they are not noisy. you wouldn;t like them. my '53 uses the stock original muffler.

You would probably like Thunderheader- a loud exhaust which is always near the top in horsepower comparisons. more roar, less raspy rattle than your pipes


4. what about power cones? will they assist?

there are a number of ways of "tuning" straight pipes from torque cones to an adjustable washer near the exit of the pipes- the washer is tured to partly block the exhaust.


there is a board on these forums for Evos- you should check in there. There are alot of smart Guys there who can alter and fix things.

https://www.hdforums.com/forum/evo-classic-models-84/


Most of the Guys on this board have late models.

Mike

 

I recommend hanging out in the EVO forum also; alot of serious gearheads in there and thet're always ready to help each other

 

Fellow Evo owner here. Looking at your bike I suspect it still uses a way of clamping the pipe extensions to the head pipes that changed in the early 90s. That suggests you may have original exhaust pipes which are no longer available, so to fit mufflers will need a bit more effort. Proper mufflers will give improved torque, as Mike says, but they are so subjective (and too many of them are too darned loud!) that I won't comment further.

 

Thanks guys,
i was surprised to see the quick and thorough responses!
i will have a look at the evo section.


Amit

 

'92 FLHTC here so I have the same "required" mufflers as you.

Just put the Fullsac "true dual" kit on mine 2 weeks ago, my OEM mufflers
have about a 5/8" hole punched through the baffle. Fullsac made it sound
AWESOME. After I removed my "H" pipe, found it was cracked on the RH side. With the 1/2 hour of riding I did last Sunday, I have to say I'm VERY happy with the sound. Much more "pop" under load but quiet at crusing rpm. Fullsac kit also gives better access to starter and transmission if work is needed in the future.

With that being said, I just ordered off of eBay a set of Cycle Shack taper tip mufflers with the "coin" connection, (saw no reason to cut it off and slip on newer mufflers). Unless it warms up, won't know until next year what they sound like with a load on them.

Looking closer at your pics, it looks like you don't have the "coin" connection on your pipe/mufflers. I'd still recommend the Fullsac duals.

 

On my '86 FLH I put on Supertrapps, great mufflers. I don't know if you still have the original carb on it or not but if you really want to help the motor put a newer CV on it. It was the best thing I ever did for that buke.