Preowned fully working OEM Stock Cats for 350Z DE which are in great shape are in stock and good to go same/next day.
I also have an aftermarket "Y" section in stock which is also in great shape.
Just drop me a pm if I can help further.
Alex.
Ben,
Let me check those tyre sizes for you when I am back in the shop on Tuesday at which time I will send you over a PM regarding availability and prices.
Regards,
Alex.
Low entry slim style ramps will not get your car high enough for an oil change I am afraid.
You will also require it up at the back so that the car is even, or at least leaning towards the drain plug so all the old oil drains out.