The reliability of an OE solution vs. a flex section wasn't my arguement... however, I doubt an aftermarket down pipe using the OE attachment method would be any less reliable than the stocker... keep in mind that using a "fixed flange" on the O2 housing also induces a "pull" on the entire exhaust when the engine "twists". Granted the Evo doesn't allow it's engine to "wined up" as much as many cars, but it does to an extent. Using a flex section effectively moves the "pivot point" from the bottom of the O2 housing to under the oil pan. The front section of your down pipe has now become a "cheater pipe" or lever. Now to all reading, I am NOT saying this will cause issue. I'm just pointing out the differences. My original argument was that the inside of an un-cut "smooth" pipe will out flow the inside of a flex section to some degree... not to mention the joints involved having to cut the pipe to place it there. I also doubt anyone could tell the difference of either from the drivers seat. Hell, I'm running a flex section because the price was right at the time.

 

We have flex sections available and build one occasionally for use in our EVO downpipes. I personally do not run one in my car or my brothers and our standard downpipe does not use it. Can be ordered that way though.

I am 100% certain that off all the exhaust manufactures out there building EVO exhausts nobody has sold more than we have since the car has come to the States. I am guessing somewhere in the neighborhood of over 500 complete 3" EVO systems have left here. They have been sold over the course of the last 22 months. We have not had a single, NOT ONE, failure of one of systems, not one.

We do not use the spring bolts in our systems. I don't feel that building them this way will do anything except give you a lighter higher flowing system. After that many systems and that much time I would say that I am probably right.

David Buschur
www.buschurracing.com

 

David, are you guys using the 0E dounut or a flat flange?

 

I'd say David can say from experience that there is not a problem... I personally "feel better" running one or the other though.

 

From the looks of your "new" exhaust system and the changes you have made to be more competitive my guess is you know what flange we are running on our systems.

David Buschur
www.buschurracing.com

 

I have only seen one of your downpipes and it was a flat flange. This was probably 8 months ago and didn't now if you made any changes since then. We have made some major changes to the systems to more like a Helix style system at a lower price. The old stlye wasn't as well built or as bling. Our new system will still offer the similar ultimate HP and lightweight design as before.

 

Helix doesn't have a flex section... They use the OE donut gasket...

 

For you guys in the states that snow - don't forget, some of the cheaper downpipes are mild steel!

Cheers,

Gary

 

does this totally clear everything with no rattling?

 

yes, that is correct.