ez on the 3g is fp [fuelprssr] only. no timing. only b-dog at this time does timing but edge will have timing in january,,,,,so they say at this time.
ive seen a bit of an mpg increase w/ the b-dog adj box. on the timing and fp setting, mid position. not the high as i just used hi to get really serious

the new boxes will have timing only position on pos 1 to help mpg even more.
you can use a boost elbow on these to up the boost
i havent had an ez on my 3g but i did have the bdog fp box which is just like the ez for the most part. on mid pos on timing/fp adjustable box i have way more power and lower egt than the fp only box. the timing does help. and on hi,,,,,,,,,,,,,,,,wow
as to 5in ex noise,,,,,,,,,,well,,,,,,,,,,,,,i have just a res on mine,no muff. but,,,,,,,,,i have heard a few 3rd gen 5inchers w/ a hiflow muff and it was of my opinion that they appeared to be fairly quiet. just the right amount of sound. of course this coming from an old half deaf guy whose previous 3 ctd/rams had 4inch straight pipes
