3" in plenty, I think in most cases a full 4" exhaust on the street is way overkill.

ok cool i figured as much since you don't see many 4" exhausts now what do you think about the tanabe exhausts I mean well hell what do people think is the best exhaust as I said I've done some research but not actually talked to rx-7 owners and that's the most important.

#2

If you do option #3, you should go with a TEC 3 and you will not need the A'pexi AVC-R, plus you will never need coil boosting hardware like the MSD as the TEC coils are extremely powerful.