BigMac is absolutly correct that LMS updated their DP using magnaflow cats,same as PPE,I think PPE and ECO POWERPARTS should of had their pat pending regarding their cats,as for SW DP i got a po42o and po422 dtc codes,after install due to low quality cats,they invested more money on the sig logo stamped SW on the DP which looks cool,today is day 3,no tune,no dtc codes with PPE,the diffence of all the DP from PPE,LMS.SW is which one will set off a code with a stock tune,and clearly PPE is on top,GO ECO POWER PARTS AND SUPPRT THE FORUM.