The results are believable. The HKS unit has the dual resonators which are known to impede flow. Regardless if they are straight through design the raised surfaces create restriction.

 

It is what it is, yes... But IT IS NOT a full 3" exhaust... The buschur exhaust would be the better product as it is lighter and produces more power. The HKS exhaust is pointless in that sense. To say that it was a test of 2 3" exhausts would not be accurate 4 Wheel Slide.

Al well done on the testing, this post is not regarding anything you said, as you quoted nothing with the diameters (I think)

 

The Megan RTP is a test pipe...it's just resonated. Many people have claimed it's 3" in diameter and works fine. My Megan RTP is more like 2.5" of inner diameter, but it has been claimed that later versions of the Megan RTP are now fully 3" inside like the rest of the exhaust. Either way, it's still a test pipe - it's not a hi-flow cat or anything, but that could be the reason for the power difference. I'll be dyno'ing my car soon to see if I got any gains from the BR TBE over the Megan TBE.

 

Good points

One thing to note - I am really at the mercy of the gods with what I get to test and when

I have the Buschur 3" V band here and it will stay here

The problem is there are only so many cars that come through our door and often both lifts are occupied

As time goes by I hope to develop a data base of exhuast testing to have some concrete data to show what kinds of exhausts work and which dont

While the HKS is slightly less than 3" - it is well designed and does not significantly neck down at the cat section. Bottom line is that HKS is a good company and I feel they must test everything they sell and this exhuast was no expeption to that.

I was impressed with the power - although the weight was IMHO excessive

 

Hey man - long time no hear!

I hope you enjoy testing exhuasts as much as I do - I find it very relaxing

 

Hah, not fun for me, because I don't have access to a shop on a whim. My shop does stuff for me, but they're not as interested in exhaust testing on the Evo - not their bread and butter!

 

this is funny... The HKS is not full 3" and had a resonated test pipe along with its own resonator. The buschur and ebay exhaust will probably be dead even.

 

btw was their a huge difference in sound between the two?

 

ha, ha! i have the HKS. you really think 35 lbs. is excessive? it is pretty heavy, but damn sturdy with thick flanges. i'd like to see the buschur vs. the megan when the opportunity arises. good work on the testing though al. i have to commend you for using your time in this R&D manner even if i don't agree with everything you do. keep up the good work.

 

curiosity, why is run 13 and run 20 compared? what were the results of runs 14-19? I imagine that after 13 the following runs were made with the Buschur exhaust? I hope you werent tuning in the mean time? or maybe just did 7 pulls until it made more?

 

i figure it this way... with a real test pipe that isn't stealing power the power is still there... imagine if it was 80mm instead of 78?mm how much more power.. it wold outflow the buschur...

 

Comn dynoflash, this is two tests now, neither of which was a direct A-B test..

 

I bet there will be 10whp difference if you dyno the same car 20 times in a row

Next I want to see a test of Bushur catback with a resonated test pipe/cat + unknown downpipe against HKS/APS/AMS/AVO full turbo back with straight test pipe...

 

 

good work, thanks for the knowledge you give to this community. no matter what people are saying about your testing, they are still reading it and absorbing the info you are giving us.