Do one after the cats, I wouldnt run them before the cats and plus you would need 2 of them. I had one behind the cats before the muffler and it was loud as crap. Really mean agressive truck sound
2012 F-250 XLT/FX4 RCLB 6.7 Powerstroke
H&S XRT Pro Race(550hp/1100tq)/ 4" flopro exhaust/H&S EGT kit/SPE Full diff unlock/S&B CAI/H&S motorsports upcharge pipe kit/ DPF,CAT,EGR,UREA Deleted/Icon 3.5" Lift-Vs 2.0 shocks/PMF DSS w' Bilstein 5100s/Icon Adj Track Bar-upgraded steel bearing/RIGID LEDs/Kenwood DNX570HD w/idatalink maestro/Hertz5x7s/Memphis 12" slim/500.1 JL slash amp/Recon f250 led emblems