The article was posted on the November issue of 5.0 Mustang magazine. The SLP X-pipes and after-cat were tested on a 2001 GT. I think I said 2000 on the original post. "From the dyno, there was an increase across the board from 11-15hp (depending on rmp) with just the X-pipes....Torque was up by 20lb-ft in many spots....With the after-cats, further gain of 6-8 hp...RevXtreme noticed our '01 GT was going lean up to about 4,500 rpm,...but with some tuning (chip or Programmer) the after-cat would have been good for at least 10-12 additional hp...But for a total peak improvement of 19.5 hp and 20.7lb-ft of torque, the Loud Mouth system is money well spent."
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