Any one running the Thunder Header slip on mufflers? Is so how do you like them.Can you tell a performance improvement?

 

When you ask about slip-ons, are you talking about Thundercones or 2 into 1 Thunderheader? Do you have stock headers or true duals? I had true duals and a sit of Thundercones slip-ons, and they sounded great. But after my 98" build, my indy told me I was loseing to much low in torque. He recomended 2 into 1 Thunderheader,WOW he was right. Sounds the same,but oh what tq. Theres not much you can do with the Thundercones or the Thunderheader as for as baffles that I know of. They are what they are. They have a sound of there on,and its good. Don't know if I answerd your ?, but I highly recomend them.

 

I am running thundercones on my stockheader system -- if you have stock motor you will not notice much of a difference with the exception of the sound -- you either love or hate the sound. I luv it.

 

I loved the sound for about the first month, and then i did a 500 mile day, and would have taken them off that night if i had anything there to replace them with. Just too f'n loud, after a full day.

 

I had thunderheader slipons my stock set up and I just loved the sound! Then I did my HQ build and the sound got even better. Then I went to the fullsac duals and the sound is now in stereo. I know I lost some low end torque but I don't care. When I pull up in a crowd they have no idea if I have low end torque or not, but they sure as hell hear me.

 

I have the 2in1 thunderheaders with the left falsee pipe.

Love the sound!!!

 

got the Thunderheader s/o when I had my '02 FLHR...sounded great at first (but found it to be NOT loud enough later on ).

 

Had the slip-ons on a 91 FLHTC and they souned great but caused a severe lean problem (acted like it was running out of gas) at 2800 to 3000 RPM when riding 2 up and a steady throttle. Could not get rid of it with tuning or anti-reversion cones so I took them back off and replaced them with some Joker Machine Fishtail slip-ons (don't think they're made anymore) and no more problems.

 

I ran the two into one set-up for the longest time, did not want to lose the low end with a dual set-up, found a set of dual slip ons and stuck the stock piping on the left side and made a mount to support the left side pipe from any movement, it looks like a bagger now with two pipes coming out the back. you have to look very closely to see the pipe does not connect to the back cylinder. now I have spare slip on I can sell. it has some blueing on it.