how many cats are on stock exhaust... it looks to me that only 1 will fit without having the exhaust stick out the back... right now i have a CS 2.5" dp to a test pipe then to the y-pipe then to the mufflers.... if i put a cat where the test pipe is, is that right.

 

Downpipe replaces 1 precat (2 on an NA car).
Testpipe replaces the main cat.

 

so theres no stock dp? just a precat? where would i get one and how much would it run me>? also i have a question... i am blowing coolant lines a lot. any suggestions wat it is? mainly the lower coolant line of bottom of radiator to water pump and the small one next to it... any suggestions?

 

Well, the expensive way is to go to Mazda or a company like Black Dragon Auto, who sell dealer parts at discounted rates. http://www.blackdragonauto.com/ICATA...l.aspx?Page=46

But the cheap way would be to buy one off ebay and get a muffler shop to weld in a new converter. The old one will probably be toast.