yeah, the reason why I said ORP was solely because of the cost factor...for 300 for that cat, though, you could probably get the ORP and a cheapo ebay exhaust for it which would most likely give you higher gains than just the high flow cat. Additionally, if you were to go with the VF dogbone mount it's 20 cheaper, i've had mine for a couple years now and am very happy. To answer the question about what the dogbone is, there are 3 motor mounts...one on the top right, which is the drivers side transmission mount, the left hand side, which is the upper motor mount, and underneath the car there's one that looks like a dogbone that's been twisted 90 degrees. this one is what we're talking about. in addition, if you can find someone with a zx3 with some sticky tires on light rims i'd borrow those and run 25psi in them. that's about as low as you'd want to go on non-drag tires. the decreased diameter and weight will help a bit.