will a gsr turbo manifold fit my 91 LS or not i need to know ASAP. thanks
Yes, any B-series turbo manifold will bolt on and fit. with only changing the place where your o2 sensor sits. O2; 90-91 on header 92-93 before the cat. You could just add wire to the sensor to make it reach. or drill and tap a hole on the the manifold.
EDIT: some turbo manifold aren’t made for cars with A/c (have to remove the A/C compressor) but gsr’s come with a/c.