yes it is a cheese grader. 31 inches long, 3 inch internal diameter, and what looks like a cheese grader all along the inside. it will make a great mid pipe after the cat and before the rear end. not sure it will be quiet enough though.
then there is kitty - 3 inch in and out - carb approved - and for the life of me i dont see it reducing the noise much. i hope it does a better job on the environment than it does on the noise.
now i have to get off my butt and get the heads and machine them. i dont want to put the headers on twice.
the system will move a lot of air, now i have to make enough power to actually use them.
i did not realize how beefy they were until i put them all together and then looked under the car for a comparison. the car stock exhaust looks like a inside of a ball point pen without a refill in it.

 

Good stuff, now get to work!