4" Round Performance Mufflers 

416  420 
4-1/2" x 10" Oval ProTurbo Muffler - 14" Body w/ 2-1/2" Pipe 4-1/2" x 10" Oval ProTurbo Muffler - 14" Body w/ 2" Pipe
16" Body
2-1/2" Pipe Ends
20" Body
2-1/2" Pipe Ends
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  4" Round Muffler

Product Info:

For a street, strip or show car, these 3" and 4" round mufflers look as good as they perform. 
Designed for vehicles where space is extremely tight, from street rod to racers. 
They fit right, look right and perform right.