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Originally Posted by Adam
The stock muffler flows pretty well the experts say. Just ask Jake Raby or Charles over at LN engineering or search some of their threads. They have done flow tests and dynoed several so called high flow performance mufflers and many lose hp compared to the stock muffler. The main slap against the oem muffler is that it is heavy.
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Now that is a great answer, not just an opinion, but supported by facts. Kudos
I really would like to know if you gain any resonable HP by bypassing or removing the cats. My first car was a mgb ltd. 1st thing I did was take off the cat and put headers on it. it really put some pet in that tiney engine. I have been following some of pedros mods, but he never tells how much hp you gain or even an estimate. Since I am keeping this I want to squeeze out as much juice as possible.
http://www.pedrosgarage.com/Site/DIY%20Projects.html