Pypes race pros are basically the same as ultra flows, they are a perforated straight through pipe with some packing in the case, cheaper than ultraflows but still a quality muffler, I run them in a 3" X pipe set up on a 500+hp stroker 467.
Can also check on ebay, there is or used to be some brands offering the same straight through type nuffler for very cheap, like $70/pr depending on size. Think it was "full boar" or something like that.
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