I haven't owned that many B14's. So, I'm not too sure. Please don't guess. I need to be 100% sure. When parts are pulled. There's NO going back.

1st. I'm wondering if the full exhaust systems will interchange between the 2 cars? I'm thinking no. Because, the Sentra seems long.

2nd. Are the suspensions the same? Meaning shocks, springs, top hats. Will they interchange? I'm thinking they will. Look to be the same.

Suspension, yes.

Exhaust, I THINK it depends on the years. 98-99 B14s had longer cats than 95-97s.

Exhaust I don't think will swap over, but yes the suspension will.

Once again, nothing guaranteed, but most companies that sell B14 exhausts sell one unit for both the Sentra and the 200SX. The only difference being the size of the catalytic converter.

EX:
http://www.overkillengineeringmotorsports.com/9520mabeex.html

Exhaust will swap from 200sx to sentra as long as the years are consistant. 98+ have a longer cat so you will have to adjust accordingly. Suspension will as well, Trust me i have done both.

Good info guys.