Exhaust size and Summit mufflers?

[SS Shaun]

OK so i went to bolt in my exhaust and its WAY to long, i guess that is what i get for buying an exhaust for an Elky so i am shopping around for a new exhaust and i was talking to my local chevelle expert and he told me for my power levels 2.25 is perfect for me. being that over the years i want to build another motor once i get this one done should i get the 2.25 inch exhaust or look at something bigger?

Also has anyone had any luck with summit exhaust systems? how do they sound? If i get a new exhaust for the price the summit exhaust seems to be the way to go