How does it have a RB down pipe,the car is N/A..

Also do you know if it has LSD?
If you dont know how to check,it should have a yellow tag on the back of the diff,telling what type of oil to put in it.

Has the engine been opened yet? or is it the stock 130k?

BTW if you post this in the Mazda section it might help you..
When can I take a look at it?
PM me..