If you never plan to run nitrous, I would definitely go with a tight 8". They are a more efficient converter. Only go to a 9-9 1/2 if you make a ton of torque, that may drive thru the 8".
We (My brothers and I) have a great relationship with JW Performance in Florida, and have sold many of their converters.
Love my 8" JW in my 904, 10.39-128 motor, 9.65-138 spray, driven a bunch.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
