Originally posted by jc836:
For those wondering-a Catalytic Convertor of the aftermarket "high flow" variety is very efficient and does NOT reduce horsepower output as much as some might think. Many years ago Hot Rod Mag ran a series of tests to determine what exhausts would work best and found that the cat only robbed 2HP on a small block Chevy. Just a thought....
Sport Compact Car tested a Nissan 240SX with a Random Technology cat and with a "test pipe." They found absolute NO change in hp, and max torque actually decreased one ft/lb with the "test pipe."


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George Roffe
Houston, TX
84 944 ITS car under construction
92 ITS Sentra SE-R occasionally borrowed
http://www.nissport.com