Best 318 headers with no modification?

K, so, more exhaust questions.....

What diameter pipe should I run on a currently stock 318? Was going to do straight pipe from heads to a 45 degree bend and dump out the sides right in front of the rear wheel well, with a 24" or 30" glasspack on each line.

Eventual plans are for a 4bbl, cam, and maybe compression and heads later, but that's kinda far down the road...


Thanks,
- CK