Another muffler / exhaust question

[FleetsidePaul]

Ive been looking at getting mufflers either online or trying to get a deal on some used ones.

My 2" exhaust pipes are rusted out and look like Brown Swiss Cheese.

So, I need a new system from My Ramhorns back, I want it loud, I like rumble, but not enough to get pulled over,and I am going all the way to the rear bumper.

My questions are:

1)How big a pipe should I run from a stock (kinda tired) 350 with ramhorns?

2)All the mufflers I look at have different offsets..I dont know the difference?

3) I'm thinking Flowmaster 40's but I dont know with the pipes going all the way back... can you still hear them without stomping on it?

Thanks....Paul