Exhaust for a slant

doing exhaust for over 20 years , i found what they say is true, which is :

larger pipe (more flow) = less low end, more top end, less clearance
smaller pipe (less flow) = more low end, less top end.
Duel exhaust (more flow)= less low end, more top end, less clearance, less money in pocket.
i put a 2 inch on my 6 and it runs fine, but then its mostly stock.

decide what the car will be used for and go from there.