I have the Ceramic coated BBK and BBK OR X-Pipe. The only thing I would change is to go with Stainless Steel on a daily driver. My car sits in a garage 9 out of 10 days so the Ceramic will hold up for a long time and I got a good deal since they were installing a slew of suspension parts anyway. My other BBK headers, chrome plated, are 10-12 years old and have general coloration from 11 years of use and some drag racing (306 NOS Windsor motor), but no rust, and that car is also stored indoors (no top on 90' vert GT).
Together the LTs/Xpipe give you a linear (not peak) 20RWHP and 20FTLBS from 4000-7000rpm. I am sitting happy at about 420RWHP/400RWTQ with just an email tune.
It's hard to measure throttle response which improves drastically. I am hitting 116+mph in the 1/4 mile. I hit 113 mph missing a shift so the car accelerates very fast now.
Some people don't like: Exhaust Gas Smell, Backfires on downshifts, and the extreme loudness. I used Hushpower mufflers and it didn't matter at WOT, it is calm at idle, but anything over 3K and it's very loud. At WOT it's going to be loud as hell even with factory muffs.
My only other engine mods include Steeda CAI and Steeda emailed Tune. Going for a dyno tune which will bring out more power with a little more risk. I do have very substantial suspension mods so next spring I am going to work on getting in the mid 11's and running in the 118-120mph speed range but the car is being geared more for the road course.
I just got a Dynatech Driveshaft in today so we'll see how that installation goes this weekend.
I keep my updates here if you want to read more on it: 2011 5.0 Brenspeed Overhaul - The Mustang Source - Ford Mustang Forums
2011 5.0 GT 3.55 gears, Candy Apple, Steeda CAI and SCT Tune,Steeda Control Arms, LCA Relocation Bracket, Pan Hard Bar and Brace, Ultra Light Springs, 3rd Link, Camber Plates, Tokico D-Spec Struts/Shocks, Shifter, Barton Shifter Bushing, Flowmaster hush power. Steeda 18X9 Chrome Pentar/Nitto NT05 275/40/18. BBK long tubes and OR xpipe
2005 F150 SXT, OX Locker, 4.10 gears, Edge CS Tuner, 33x10 AT, K&N FIPK, Gibson Exhaust.