Hi sifus. Also want to ask the same question. For LMST the stock exhaust system is using 4-1 extractor right? Would a 4-2-1 extractor be better for pickup? I'm looking for better pick up especially in the 3rd and 4th gear.

Also any recommendations on the extractor brand and exhaust piping size? Plan to change the set from extractor to piping but want to maintain the original muffler as I don't want any change in the exhaust sound