Just got an estimate for $900 or so in work that I need done on my bike so I guess new slip-ons are on hold. In the mean-time I am thinking of 1)removing some or all of the baffle wrap or 2) maybe even cutting the baffle or 3) both on my Vance and Hines Basic slip-ons. Do either of these steps affect the back pressure in a negative way? I am simply looking for more volume to hold me off till the new slip-ons. Thanks.

 

Wrap will effect both back pressure and sound as will cutting the baffle.
Neither will probably result in a huge diff. assuming you don't cut the baffle down to 1"...lol

 

Thanks Tazz - but do you mean neither will prob make a huge differance in affecting back pressure so I shouldn't worry about that or do you mean neither will praob make a difference in the volume?

 

Either will affect back pressure to some degree... probably in a direct relation to the degree of modification you make.

But consider this... The torque you sacrifice by reducing the back pressure slightly will probably be offset, psychologically anyway, by the louder pipes.

Ever notice that louder feels faster even if it really isn't?

 

Think of it this way... baffle wrap and the baffle itself limit the outward exhaust flow. This generates back pressure. The more of either the wrap or the baffle you remove, the less restriction occurs, thus less back pressure.
A straight pipe, with no baffle or wrap results in the least amount of back pressure leaving only the pipe itself to limit the amount of air flow.

The loudest pipes you have probably ever heard, were likely pipes with no baffle or baffle packing.

Often times, pipes that originally had baffling, over time, burn the baffling right out of them. They will sound louder and provide less back pressure if so. Some elect to buy new baffling wrap and re-wrap the baffles to either quiet the pipes back down or to regain some lost back pressure.

My Vance N Hines straight pipes on ym Roadstar came with nobaffle wrap, however, the baffle itself was a long 22". I took the baffle out and cut it down 10" to 12" long. The result, was a bit louder and less back pressure. Since i liked the new sound and there was little seat of the pants difference in performance, I took them out again and cut another 6"s off to 6" long.
I lost some back pressure, but not enough to make a big difference...but I gained a good bit of noticeable deeper tone and loudness. I never did feel the need to rejet the carb, again, it didn't make that big of a difference.

Now if you have a long 22" baffle AND baffling wrap and yank it all out at once and just run a straight pipe, you might just notice a large lack of back pressure and performance.

In your case, I wouldn't think removing the wrap and shortening the baffle would make a ton of difference with a slip on muffler. You should gain some sound tho.

If you're going to yank the baffle, try running it without the baffle and see what you think. Shouldn't be harmful for a short term setup, just not ideal performance.

If you want a real nice sound, save up for a full true dual exhuast sytem.

Phew......hopefully some of all that made sense....lol

 

Ha - probably true!

 

Makes perfect sense to me - Thanks. Looking forward to a little more volume until I can get a new exhaust system - whether it be louder slip-ons or a true dual.

 

i've done both on v&h true duals....cut the baffle in half or at least 1/4 of it off....rewrap the packing....go ride....it'll sound better and you'll feel better....in truth, you didnt do **** but make yourself happy....on mine, no packing wasnt for me...if you leave it alone and ride it, it'll melt out the packing naturally and wont assault your ears...cuttin much more than half ruined my baffle....also, note on the v&h baffle it has a big end on both ends....i welded em back together after the cut

 

Pulling the wrap will let the baffle rattle and sound like ****. Don't ask how I know...