Juanes,

the bolts are about 1 3/8 apart on the zdz and about 1 5/8 on the EVO so unless you are a good machinest you'll need a new muffler.

with the EVO the yak came out 18 lb 11 oz RTF I have only had the chance to fly it once with this setup but I can already tell a night and day difference between the two...tons more power with the evo