Repacking an exhaust

[beherenow71]

How do you know when/if an exhaust needs repacked? Is it hard to do? I recently bought a used exhaust and was wondering if this was something I should consider.

[shadowhunter04]

i don't know that you ever really need to, but it really depends on which kind of can it is to determine how to do it. I know with my old Vance and Hines cans, I had to drill out the old rivets at one end in order to get the cap off. Once the cap is off, just pull out the old crap and pack in the new (preferably wrapped around the inner mesh cylinder).

[Dom]

Here's a thread showing how to repack a Yoshimura RS-3.
Should give you an idea.

http://katriders.com/vb/showthread.php?t=85287&highlight=yoshimura

[md86]

I've read that it's every year or 2 they need it . It ain't all THAT hard to do , or costly . I just did mine a few weeks ago , in fact .

[beherenow71]

What effect is it supposed to have? Just makes it sound better or does it make it run better too? I've been able to find help on how to do it, but not what the benefit would be.

[shadowhunter04]

It may muffle the sound a bit better, but making it run better or "sound better"... i doubt it :/

[hardlydangerous]

Once a year or every 5000miles

The packing does two things
#1 restores HP. by insulating the pipe and keeping the gasses inside the baffle you actually speed up the air flow for better flow
#2 sound waves are absorbed and it will deepen and dull the noise a bit.

[md86]

Yeah ,mine's running different .I had been tweaking the jetting a bit ago , and now the new packing , I think I have to twiddle a bit more . So it DOES effect performance if it needs to be done .