Hey everyone. I have read a lot of threads on here about exhaust and which one to use. Since everyone has given their opinion I will give mine. A friend of mine has a 4 cylinder mazda pickup.. he has a header with an imco muffler on it. I went to the exhaust shop close to me that I have had do work for me in the past and was talking to the main guy there. He said that he flew to the imco headquarters and they proved that their muffler flows 20% more than the flowmaster. I asked him to the put the imco extreme muffler on my dodge. All it did was replace the existing flowmaster (single in - dual out) i have noticed a small jump in performance compared to the flowmaster and also a better tone from the muffler. I am sure with a set of headers and true duals it will run even better.

Here is the imco exhaust website Imco Performance

 

dont kill your backpressure completely u still need some for that engine to run right