Running rich?

[90dpscoupe]

lately my car has had strong exhaust fumes, i would assume they are rich conditions, i havent pulled a plug yet, it has been running fine though, as far as performance, my last modification was my offroad h-pipe, and 160 stat, i suspect the exhaust smell to be a leak, and of course i have the airtube plugged into the h-pipe, but the smogpump is bypassed, am i getting exhaust leak from there? also one of my o2 sensors was cross threaded, but went in almos all the way, and seems to be working fine.

Thnx for any help on this matter.

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90 lx coupe: 5spd, energy susp trans mounts, fms hd clutch, Mac coldair fenderwell, Mac h-pipe, supercoil, ADS chip, 160 stat, aluminum D/S, Black magic fan, 3.27grs.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607

someday mods:4.10's, slicks.