S & S/S rules about interior mods, concerning B- pillar.

Can any modifications be made to a car behind the b-pillar? Example 1- cutting rear deck 2- removal or floor or headliner carpet up to b-pillar.
I wanna know how to do something right the first time. I competed in 2007 best 149 on TL. Still interested.

stock is no cutting, superstock only allows mods behind the b pillar and under the window line.
you can cut your rear deck for superstock. you cant cut the floor.

ive been wondering on the headliner rule a little myself, i know you cant make one that is stronger than stock, like makin one out of some 3/4 inch wood. but ive competed in several shows last year without a headliner, i think to rules say you must have oem headliner though

cool, im just gonna come out with what I want to do. If I have to compete in someother class so be it, its gotta be something of my own.