I had heard and read so many good things about the Dynomax large case mufflers that I had settled on a pair for my 62 Catalina. Unfortunately, they are not available in the large case, double offset inlet/outlet. I searched every brand I could think of and NONE of the common manufacturers made this case design except for the AP Xlerator stainless case mufflers. I was skeptical but ordered a pair because the size was correct. They were also reasonably priced for a stainless steel muffler. Much to my surprise after installing them yesterday and driving around for 100 miles, I really like these mufflers. System is 2.5" front to rear and it is a tight fit. Car is quiet at cruise, not raspy under power like almost all chambered mufflers and deep/throaty/but muffled at idle. Engine dyno'd just under 500 HP, solid lifter cam, 251/259 duration @.050. Idle 1000 RPM. I recommend these for street use if you don't want a really loud/raspy exhaust note.
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