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I replaced the engine with a 350 out of a Chevy 1/2 ton PU. I am also installing a pair of Flowtech 11100 headers. Wanted to purchase the flowmaster before I went to the muffler shop. I want 40 series but I haven't been able to find out for sure if they will fit. I would like to run at least 2 1/2 pipes. Please help.
 

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I am not a mechanic but I think you can just buy the muffler that will fit the size of the pipes you are installing. The Flowmaster 40's come in different flow/noise ratings and different inlet and outlet sizes. From what you wrote I am assuming that you are have a set of pipes customize to your car. Here is a link to Summit Racing that should help. I already entered the model you want. Just choose the 40 model you want and in the pipe diameter in and out. Hope this is what you wanted to know.

http://store.summitracing.com/egnsearch.asp?Ntk=KeywordSearch&DDS=1&N=700+115&searchinresults=false&Ntt=flowmaster+40
 
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