I also have a '90 Volvo 740 turbo. This car came without an egr or air pump from the factory. Although it is a four cylinder I figured if it could pass so could the stang. The stang had lower emissions than the 740 across the board.
The 740 has a 3-way cat to clean up NOS emissions. Maybe some of these newer H-pipes are being mfg with 3-way cats?
Mike
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