They are not popular, but I run a Spin Tech Sportsman. This is the second vehicle I have had it on. The first was a 1.8L. It actually sounded like a V8! The 4.3L I have it on now sounds every bit like a big block. And they have the least back pressure of any aftermarket muffler. Here is the link
I have a Magnaflow ready to go on my XJ when I get around to it. When it was on my v8 chevy it has a nice sound on accerlation but toned down at idle and cruising speed. It didnt resonate into the cab like the dual flowmasters I later put on did.
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