Yes, of course...

It's a Warrtalon Xmas Part 2 - Buschur Porting & Coating

Notice, I originally had the stock o2 ported/coated, but that is right when David tested an Ebay o2 and made more power than the stocker. He bought a bunch and started coating them and selling them, so I just switched out the stocker for the Ebay one, and have used all those parts since...

 

You could always do it yourself: http://users2.ev1.net/~subaru/evo_web/evo_exhaust.htm

 

Which would likely yield far less impressive results...

 

isn't what that guy did the same as what BR would do? So why less impressive results?

 

I don't know. Do you have the skill, the knowledge, the tools, and the materials to do it all yourself? Please feel free to attempt all of that and let me know how it goes. Anytime you can do something yourself at the same quality and skill level as an expert shop, of course you should do it yourself. However...

 

I agree w/ Warr... send it to BR, they did a good job on porting my Ex headers. It will not take long to ship, coz they're in OH. Buy a used core, so you don't have down time.

 

So what were the pre and post dyno results?