If I were to switch out my stock (2007 FLHT) slip on exhaust for a screamin eagle exhaust, do i need to do anything else? ie calibration, etc... (i hope not)

 

I don't think so. If it's injected, it should be able to self adjust for an exhaust only change.

 

One follow up question. How much of a sound improvment will i get? slightly deeper rumble? bit louder? (vs stock flht)

 

Did you change the exhaust? I'm looking for a stock system.

I've got the same bike. Here's what I've done.
103 ci
Screamin' Eagle heads
Works direct drive cams
10.25:1 compression (w/compression release on heads)
A.I.M. clutch
Two teeth off the engine sprocket
Rinehart exhaust system
Stage III intake

It makes 109 hp on the dyno at Carson City HD in Nevada. And, it will run the speedo needle right off the end. 'Course the frame doesn't like that much, and it eats rear tires every 4k miles. It's run 24k miles with zero problems

I'm going on a real long tour and am looking for a stock exhaust. If you want to know exactly what changing mufflers only will do, other than noise, let me know.

Tom Murphy
Las Vegas, NV