nelson tune q?

i just got my 2006 gmc 2500hd with 6.0 and want to have a tune done to it.also looking for a few other mods or bolt-ons to gimme a little more towing power.

my question is on the nelson tune:
should i call to order it or just fill out the custom tune order form on line??

does it matter???

thanks
andy

either one would work.

decide on mods first then install them, then contact nelson via the website or phone call !

Either way is fine and you'll talk to someone regardless , so we can go over the details.

thanks,!

great,
thank you all for the input.