Twitch de la Brat Posted August 19, 2014 Share Posted August 19, 2014 So, this is a rudimentary math sheet I did for flow rates out of a 1.8L engine. https://onedrive.live.com/redir?resid=9CA0A508CEACADDB!1327&authkey=!ACJ41AFMcHkhIuI&ithint=file%2cpdf This doesn't account for expansion or restriction. It is merely a maximum flow for an NA engine. Turbo charging changes all of these calculations drastically with compression rates and thermal expansion. But this allows you guys a formula to start with if you want to figure out the best exhaust size for your car. Twitch PS: The stock exhaust on an EA car is about as awful as you can get. The flow rate of a stock EA exhaust is still creating back pressure in top gear. Link to comment Share on other sites More sharing options...
GR3AS3M0NK3Y Posted May 5, 2015 Share Posted May 5, 2015 So, I have a 1982 Subaru GL that I am currently doing a restore on. One of the things I want to change, and trust me there is a long list, is exhaust. My plan is to keep the cat in place but rebuild cat back removing the muffler. I was curious if this is a decent idea and if so, what diameter pipe would I experience the best gain with? Link to comment Share on other sites More sharing options...
zeb1234 Posted February 25, 2016 Share Posted February 25, 2016 i dont know the science but i eliminated middle cat.2inch y pipe to a standard exhaust generic. runs somuch better carb e82 from a 81-83 car 3 spd auto Link to comment Share on other sites More sharing options...
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