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This is a comparison of 2.5 vs. 3" downpipes done by ATS racing.

http://www.mr2oc.com/showthread.php?t=2 ... t=2.5+inch
"Here's a KO 2.5" vs. an Aussie 3". Looks like the Aussie starts making more power at around the 125RWHP/180RWTQ point on the graph:"


@Toxy: I think your best bet would be to gut the stock precat and then run a high flow in the midpipe. That way it passes visual and smog without too much restriction. I wouldn't bet on something like that SARD DP working because it's obviously not stock and technically you have still modified an emissions component (unless the SARD has a CARB number) Yes, I know it doesn't make logical sense, but thats our smog laws for you.

J.

^^^^^

That thread is about the difference in DP not a whole 3"system or a 3"DP with a 2,5" system.

Not much ST185 owners on this board have 300 WHP like the MR2 in that Dyno.

there is also a divorced wastegate downpipe i see pop up every once in awhile on MR2OC, however you have to relocate your oil filter to use it.

BTW, if you look on the second page, the guy says that it costs over $800 for that sard plus shipping. if your only doing it for inspection, get a berk tech, and cover the flex section with some sort of heat wrap and i bet they'll think its a cat. its the right size.

I think you are missing a couple salient points. The test was for downpipes, but they didn't test a 3" downpipe with a 2.5" exhaust. That would make no logical sense if you wanted to test the difference in diameter. The 2.5" DP was either with a 2.5" exhaust or no exhaust at all. The 3" was either with a 3" exhaust or no exhaust at all. Also, don't let the fact that they are talking about DPs only confuse you. Just think of it like they are testing a 2.5" restriction vs. a 3" restriction.

Also, it doesn't necessarily matter that most of our cars are not making 300whp. It is a mistake to concentrate only on peak power. As KBlake said, the 3" system starts making more power a 125whp. So unless your car is making less than 125whp, you will see some benefit with a 3" system vs a 2.5" system. Of course, the more power you are running overall, the greater the benefit.

J.

All I'm trying to say is, a 5hp difference would not compensate to the added noise of the 3" for me personaly.

My 3"aussie is such a tight fit, it rattles an resonates quite a lot. Having 5 hp less and less resonating and rattles would make me consider a 2,5".

^Absolutely. For some people it is an issue. So we basically agree that the real advantage of a 2.5" system is sound. The 3" is for those for whom noise isn't as big a concern. Or those who don't want to ever have to redo their exhaust system if they want to move beyond the capabilities of the stock turbo.

BTW, if you have alot of buzzing, I think it is possible to fiddle around with the Aussie system to get it to not rattle. Might want to make another thread and see if anyone has any tips for getting rid of the buzzing.

J.

Back on Topic now....

I'd definately be interested in buying one in the near future...
Although I don't think that it would fit my 2.5" Exhast Depot DP...

~bloodMoney

^Never heard of that one. But generally the flanges of the various DPs, MPs and catbacks are made so they will bolt to each other. I know my ebay DP bolts to my stock MP and it bolts to my HKS catback (all different sizes) just fine.

J.

If the Berks MidPipe is 3" SS, with a high-flow cat option, I would be interested in purchasing one.

Of course I would like to see pictures of the final product and installation on a ST185.

^Of course. This isn't a "commit to buy" thread. This is just a thread to convince him that there is enough interest to make a prototype. Then when we have the first one made and we know the price, he can start taking actual orders.

He offers a high-flow cat option on his mr2 exhausts. I don't think it would be a problem to add one to these midpipes.

Hopefully, if this product goes through, we can convince him to become a board sponsor. Several of his other products for the 3sgte are pretty nice as you can see from the DP and turbo kit above.

J.

Bump! I'm going to let this go for about another week and then contact Berk with the results. So if you've been waiting to vote, nows the time!

J.

was there ever any kind of response on this one ... a berk midpipe would be sweet; their downpipe looks gorgeous.

I know its been a super long time since the last post but des anyone have any info about this?

damn would really like berk to make one for us.

i already own their 3inch DP.

would love something from them knowing it would be affordable and have their quality.

instead of our 2 options from aussie or xspower one.

same i have a berk dp, i'd like a midpipe option from them as well as their quality is superb