I am not sure about those "high flow" cats, but when i was having issues passing smog, i purchased a so called 'high flow' cat from magnaflow.
i was running gutted cats and mils plus the new 'high flow' cat. i failed the smog test before the new cat and my readings actually got worse after replacing with the new 'high flow' cat.
i dont know if you can have larger openings in the cat and still maintain the same emissions level. even if the cat is bigger, i think the higher the flow, the more likely your toxins will just blow right by the cat.
just my opinion.
Last edited by GoldenTour; 09/09/05 02:57 PM.