Exhaust Question

[revpat]

I just bought a pair of used debaffled S&S 4" slip on exhaust for my '07 RSTD. I haven't put them on yet but am a little concerned about them not having a baffle (for backpressure), thought they do have fiberglass wrapping inside.

My question is how do you think this will affect performance? Will I have to rejet the carbs? I should add I have installed K&N air filters as well. The bike is somewhat new to me and currently has Harley Ultra pipes on it and I am looking for a little more volume.

Any input would be appreciate or a link to another thread if this has been discussed elsewhere.