I'm in the process of installing their t/b exhaust. The stock downpipe has a doughnut type gasket to the turbo but my downpipe has a flat flange. Doesn't quite seem right. Am I just overlooking something here?

My next question is my new downpipe has a measured 2.5" flange that bolts to the turbo...again is this right?

Any quick help would be greatly appreciated for I am in the middle of this project
Thanks, Wayne

 

I think (mine was installed by a friend, but I was there) that the donut gasket is not used. Someone correct me if I'm wrong...

 

Yeah, you don't use the stock donut gasket or spring bolts. In fact, Buschur says no gasket needed. I say B.S. It needs some kind of gasket and some way of flexing. I sold my Buschur downpipe and am getting a much higher quality HKS pipe.

 

Its not BS, it works as stock with significantly higher flow.
I'll defend their products to the highest degree.

Dave, question...before I installed the DP, I noticed the tubing and flange have different diameters. Any benefit to porting the flange to the size of the tube and smoothing it out?

 

You don't use the spring-bolts or donut gasket.. Its not needed, the "Sleeve" fits into the flange correctly and seals well, buschur supplies bolts to use in its place... Although I tend to agree the downpipe might need a flex section, I have had the downpipe on my car for almost as long as the Evo has been available in the USA and not had any issue with it.

You can benefit somewhat by porting the O2 housing, but the flange portion and the lip, and the way it fits together, its best to leave that portion alone.

 

Cool, thanks guys. I got the exhaust hung 2night but I am having trouble with the exhaust being right next to the second (from the front) driveshaft carrier bearing (not sure what it is called). Tomorrow I will try and shimmy it around and then I will tighten it up.

 

No question the Buschur flows better. I do not like the fact you do not use the spring bolts and there is no flex section at all to compensate. Malibu is correct. The way the flange fits in to the pipe makes for a decent fit even though I prefer the donut for a 100% seal.

I had mine on the car for a short period of time and liked the gains, but did not feel comfortable with the way it had no flex at all. And the hanger piece was incorrectly welded so that I had to stretch the rubber hangers to meet the welded hanger on the pipe, meaning it was welded about an inch too far foward. Regardless how I feel, good luck.

 

Not sure if it was welded incorrectly or intentionally.. I was already aware of that and "rotated" the hanger and it fit fine..

 

Just got it all buttoned up and aligned properly and came back from my testdrive. It really sounds great under wot. No droning at all while cruising. This exhaust with the magnaflow and no cat is exactly what I was looking for. I was a little worried it might be too loud, but am very happy so far. The clamps they use are very cool and make the job easy.

 

The downpipe works beautifully. Before you call BS on a product you need to know what youre talking about. Im glad to see youve brain washed by all the HKS hype. Their downpipe is not better just prettier looking and yes Ive held the downpipe in my hand. Ill always say Buschur products are high quality and a great value. Never had anything break and my buddies in the DSM community have used him for years.

 

I did not call BS of the product and Burschur as a whole, I called BS on it NOT needing some kind of flex. Why do all other manufacturers use either a flex section or the stock spring bolts? I don't think Buschur has better design engineers than Mitsubishi. With no flex, the pipe has no flexibility. The engine vibrates after all.

No question Buschur products work and make awsome power. I just hear a lot of fitment problems and no instructions all over this board. Don't tell me their welds compare to HKS stuff. No way. My downpipe was welded very crude, had metal shavings all inside and was greasy filthy when I received it with the flange poking through the box.

Brainwashed by all the HKS hype? I have a few of their products and they are of the highest quality and OEM fitment. You don't have to defend Buschur since i see you put thousands of $ in their products on your car.

 

sin, thats a better explanation...I just got my *** in gear. Good points, however.

 

The downpipes are now available with a flex in them for anyone interested in having one in the system. We just went through some more changes on the downpipe to allow for room for a flex, more room for the highflow cats and to try and completely eliminate the spacers from the tie bars. The flex will add $80 to the cost of the downpipe.

The welds, not sure what you didn't like on them sincityevo, not happy to hear you thought they looked bad though. If it was an old DSM exhaust I could understand as they were MIG welded, the EVO exhausts are all TIG welded and look great in my opinion, and I am a pretty darn good welder to judge them.

David Buschur
www.buschurracing.com

 

i still used the spring bolts.....is that a bad thing?

 

There are instructions with the exhaust that clearly say to discard the stock bolts. Yes, it is a bad thing, use the bolts that were sent to install the system.

David Buschur
www.buschurracing.com