The streetable one, to be more specific. I just threw mine on and it seems to be more restrictive than when I had the stock exhaust manifold with a straight pipe. When I bought it, the guy told me the collector at the end of the header was only 2". I'm not sure why that is. I measured the inside diameter and it seemed to be approx 1 3/4".

So if you got one sitting around can you tell me the inside diameter of the pipe? Both the collector and the side that bolts to the engine? I called RB they only told me OD. I'll take mine off a little later and take measurements.

 

Nobody?

 

Are you talking about the one the no longer make?

http://racingbeat.com/FRmazda2.htm

I've got one of these new on a shelf I could take measurements of if need be.

 

I clicked the link it just sent me to their main fc page. Like I said I will be pulling this off soon and I will take measurements. I've had headers at least 5 years old that ran less restrictive than this one. This definitely looks older though

 

If you don't want it... I'll definately buy it off of you. I need a cheep down pipe (turbo to cat) for my TII. I spent the majority of my cash on everything else. Lol.

Thanks,
Scott