Mine is behind the old style 97 VR4 bumper without A/C, I cut the bottom of the crash bar out and mounted the FMIC under it, so the face of the FMIC sits flush with the face of the crash bar. My FMIC is approx 28x8x3. and the inlet/outlet are centered. The newer bumpers appear to have more clearance. I wouldnt try anything thicker than 3" and I would try to get one with the inlet/outlets near the bottom, this should give better clearance for the pipe to clear around the lower edge of the radiator support.
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