99 2500

That GMC looks really good!

Yes they did, some had the round coils and others the square coils.

Thanks

Like the title says, when will we see the 2.7L engine option on dealer lots so I can go test drive one.

This 2014 looks like it's vibration free past 140 mph http://www.performancetrucks.net/forums/gmt-k2xx-trucks-general-discussion-221/140mph-2014-5-3-run-523132/

If I saw this thread earlier I would have recommended Dynomax 17235, 24 inch case. Can almost guarantee no drone while cruising but deep tone when accelerating.

What performance gain did you see? I got .2 seconds reduction on 0-60 on my G-tech meter, this is going from a single large magnaflow 22" case lenght with two 2.5" inlets and one 3.5" outlet to the dual 2.5" Dynomax mufflers. The funny thing is that it's quieter too and a more refined deep sound than a loud raspy sound.

I have dynomax ultra flo ss mufflers on my 1999 6.0l and would not trade the sound or performance for any of the previous mufflers I had on ( flowmaster, magnaflow ). They are the offset inlet and center outlet part number 17289, quiet up to 3000 rpm's with deep powerful sound after 3000 rpm.