PS, maybe the works and invidia houseing just came out because they actually took the time to R & D their stuff instead of just porting and coating stock houseings. Or your newest edition, the "lets slap some stock flanges on two welded pieces of pipe with an 02 bung". Yep, quality. Kinda like your slip fit exhaust systems. I really want one of those bad boys!

 

Well before you said "Not saying that it makes a damn difference horsepower wise."

But now youre saying its a restriction. A restriction is a limitation, in this case in power. If its proven or even agreed upon that the 3" flange makes no difference in power than how is it a restriction?

This is what Ive been saying since the start of the thread.

Other than Works, (and the new Invidia which has just been released this past month), all 02 housings available were 2.5... so a 2.5 flange just fit the 02 housing. So unless the 2.5 02 housing is a restriction (limiting factor) in power, then the downpipe flange certainly is not.

I came to the thinking that the 2.5 02 and downpipe flange of 2.5 is not a restriction after seeing FP's test on a 2.5 vs 3.0 housing on a GT30R in which the 3.0 made no additional power. This was also on a 2.5 flanged downpipe of course.

So until its proven a 3" 02 on the stock EVO turbo makes more power, having a 2.5 flange really means nothing.

If you want to get really technical in terms of marketing... Buschurs DP is a flanged 2.5 with 3" piping. What DB is saying is that it doesnt matter if his DP was flanged at 3" because the 02 housings available (Other than Works and I think the new Invidia?) is 2.5.

 

I said that because its not proven yet. Someone would have to dyno a car with both a works, invidia, buscher, and whoever else's o2 to find out. By your reasoning, saying that a 2.5 o2 flange doesnt make any more power then a 3 inch, then why do you need a 3 inch exhaust?

Let me clarify. If one part of the exhaust is 2.5, then for restrictive purposes, that makes the whole exhaust 2.5. Since theres a bottleneck there, it makes no damn bit of difference if the pipe behind it is 3 inch.

Now the real question is this....

Is 3 inch really even necessary on our cars? I mean if theyve been making all this power with 2.5 inch o2's, why not just run full 2.5 inch exhaust? Or here, this will bake your noodle too...how come all the japanese tuners dont make 3 inch exhaust? Most systems like HKS, RNR, all those are 2.75. So all the argueing about ours is 3 inch, our *ock is bigger then yours, etc could have all been in vain.

Thats the point I'm trying to make.

Thats why I said its all marketing. Someone stuck it in our heads that we MUST have 3 inch exhaust or we'll DIE...and now we just dismiss it if its not. Its probably all BS. But we wont know unless someone runs a test on it. Thats all I'm saying. Personally, Im going with full Works products. They do their R&D in house, and their quality is the best hands down. They dont just toss crap on the market to make money.

 

Ya, most US vendors use only true 3" mandrel piping. Most of the JDM systems have the neck downs.

 

Believe me, I want to know as bad as you. I understand completely what youre saying and I dont have the answers. Hopefully the dyno tests will reveal something to give us a lot more data to go by.

Im axiously awaiting the test results.

 

Right there with ya

 

Having an O2 sensor housing with a 2.5" dia outlet does not negate the benefit of a 3" diameter exhaust system. Friction on the sidewalls of the exhaust system contributes to creating back pressure during exhaust flow. Larger diameter exhaust systems have less sidewall friction per cross sectional area and develop less back pressure from sidewall friction.

 

yep, we make the real bad *** stuff...

 

I don't like how you have to remove the O2 housing donnut to fit the Buschur down pipe. Plus I could never get my stock lower braces back on with out spacers and longer bolts. Every time I install the Perrin, it just works.

 

Im awaiting these results. I went with Buschur parts because they have been DYNO proven to make power and wont break the bank. Had them on my 2003 now on my MR 2006 and Im very happy with fit and finish.

Works should of dyno tested that VERY nice O2 housing,for such a nice EXPENSIVE cast piece it makes you wonder why they havent.

 

I guarantee that they dyno'd their o2 housing. The question and what makes you wonder is the fact that they stopped promoting them and havent posted any charts.

 

HMMMM agreed !!! And its $450 and you have to use there downpipe..

Very nice pieces for sure but without dyno proven gains I will never buy one.

 

they did test them they got 15 tuned hp... i don't think works really cares to promote any of their stuff. they don't make that much of it and it just gets back ordered and people become upset.

 

Graph? DynoPlot? Charts?

I really like the invidia housing and it keeps the gasses seperated..Stock ported is good enough for me...

Im wondering why works went with that particular style without seperating the 2 gasses?

Its hard to get into works engineers head without them answering these questions with proof or dyno charts...

If it makes more power thats great but some of us love proof before we make a purchasing decision.

I do admit works products are a work of art,but for my $$$ even if its not as pretty but its proven to make power Ill go that route.

 

While I can kind of see where you're coming from, if you read what you wrote again it makes no business sense. Why would anyone not want to sell more of their product?