Mac L/T Headers

[BIG D's SS]

What will I have to do to install long tubes. Can I drive it to get it tuned or will I have to haul it? I guess I will have to put the O2 sims on it or can I just block the holes and have them deleted?

[PontiacFan]

I thought Mac's were 'mid-length' style on the LS1?!?
Drive it to get it tuned.
O2 Sims are a good thing.