Catalytic Bypass Advantage???
Is there any advantage to adding a Catalytic Bypass? I have heard that it improves flow and adds HP but in some cases the difference in nominal and not worth the mod.
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My supercharged F20B didn't benefit at all from the BYS straightpipe cat replacement... I have similar HP numbers to those who have "stock + SC" cars. Plus, my exhaust pipes are stained with black soot...
Our stock catalyst is probably a very high flow unit, so I would keep it and do the environment good :) |
no advantage on n/a cars
i dynoed mine with and without cat with onl;y enough down time btwn dynos tyo swap parts 10-15 min with the test pipe i gaine 1-2 horse everywhere in v-tec lost 1-2 everywhere not in v-tec lost 3-8 torque EVERYWHERE - i was told this is due to no back pressure btw this was done with spoon headerr and exhaust and injen cai |
btw exhaust fumes where terrible smelling without cat especially in a convertible!!!!!
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Great information everyone! Thanks.
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uhear, that use to be a great mod on alot of cars but now adays it doesn't pay, especially in Cal. you could get a $10k fine for it. Most cars built anymore loose HP then gain and the little you get any more doesn't do anything that you could notice.
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When I bring my car out of storage next spring, I will put my catalyst back on... and get the car dyno-ed to see if there are any changes.
In addition to the harm I am doing to the environment + the nasty exhaust smell, I will not miss the black soot stain on my exhaust tips... |
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