GI: N/A Downpipe w/ Hi-Flow Pre-Cat

[NJP5Guy]

hey Sub. i'm on the same boat you are. i want to retain both cats for emissions while still increasing power. i asked wagner about making a mid pipe w/ both cats so you could run a full header. he said it'd be about 450(w/ two random tech cats). the only issue we'd have to deal with is with the 02 sensor that comes after the 1st cat(stock itd be the precat post o2 sensor) because we'd need to have a longer wire attached to it because it would be farther downstream. that should be a simple fix. i personally like my idea of the twin cat midpipe. what do you think about that idea. and with running a full header youd definately gain more power and it'd be cheaper than getting three different exhaust pipes(the short header, down pipe and mid pipe)

 

[fLyPiNoY7]

hmm...im trying to figure out how our setup is...if im not mistaken, the first o2 sensor is before the precat and the 2nd is right after it correct?...i too am trying to get this kind of setup without losing emissions...got the wagner shorty on but everything else (minus the mazda sport exhaust) is stock...btw, will there be any huge problems from going from a 2.5" to the stock diameter piping?...i will be keeping the piping from the stock catback for a while until i get something custom made...

 

[NJP5Guy]

if all the piping before the cat-back is 2.5" and then the rest is stock it will reduce the power potential of the car(though having the 2.5" is better than the stock diameter which is very narrow). if you increase the diameter of the system from the cat-back(remove the rest of the stock plumbing so the whole system is 2.5") you will have better flow and theoretically more power. Ultimately this is what i want(to remove all the narrow stock exhaust components w/ the exception of the cats). right now it all comes down to money....as always.

 

[Subghetto]

hey Sub. i'm on the same boat you are. i want to retain both cats for emissions while still increasing power. i asked wagner about making a mid pipe w/ both cats so you could run a full header. he said it'd be about 450(w/ two random tech cats). the only issue we'd have to deal with is with the 02 sensor that comes after the 1st cat(stock itd be the precat post o2 sensor) because we'd need to have a longer wire attached to it because it would be farther downstream. that should be a simple fix. i personally like my idea of the twin cat midpipe. what do you think about that idea. and with running a full header youd definately gain more power and it'd be cheaper than getting three different exhaust pipes(the short header, down pipe and mid pipe)

That's a really good idea too bad no-one brought it up before. LOL it's too late for me though I going to order the MAM cat-less mid-pipe from beau and then all I need is a cat-back section pipe and hi-flow j-pipe and my set-up is complete. But good thinking. I talked to beau about the mid-pipe being 2.5'' and he said that it would not hinder me as the only thing I have is the wagner ss shorty header and the HKS hi-power axle back so getting rid of the 2nd cat and stock down-pipe would net me some nice mid-range power because I still have some back pressure although I plan to go all 2.5 because I don't want to change piping down the line when I decided to go turbo.

 

[Dimitrios]

A 2 cat mid-pipe would work, but how well?

The 1st cat is where it is so that it fires up earlier than the 2nd cat, thus reducing as much cold start emmissions as possible....thus having the 2nd o2 sensor after it so that it can sense it catalyzed.

If the 1st cat is even further downstream, I can't imagine it being the same (than where it is now).

I'm starting more and more to like flat_black's idea: full header, 1st O2 in the upper pipe area (near the head), the 2nd o2 after the 2nd cat in the midpipe (weld a bung in there).

Gotta see how other cars are setup...

 

[Dimitrios]

I just emailed David as well....I'd like to know what that model cat is so I can get a downpipe fabricated myself. I think Andy's is way overpriced (of course, not knowing what that Random cat is going for).

Email reply back this morning:

If you want to build your own downpipe, just order the 8100 series converter to match the diameter of the tubing you plan to use. Part numbers and sizes are as follows:
812000- 2"
812200- 2-1/4"
812500- 2-1/2"

We can certainly build a downpipe/converter assembly, but I'm not sure if we'll be any cheaper than Wagner. If we built it as a standard production part, I don't think it would be any cheaper than the one offered by Wagner.


That said, a quick google search for pricing:
Random Technology 810000 series "Ceramic" Converter


This is the smallest Ceramic converter available, just marginally larger than the 700000 series converters. Like the 700000 series, this converter is perfect for tight applications and good ground clearance. The 810000 series flow just a bit less than the super high flow 700000 series.
Available in 2.5" and 3" inlet/outlet. Larger sizes available by special order.

# 812500

810000 series "Ceramic" Converter - 2.5" Inlet/Outlet
$164.95


# 813000

810000 series "Ceramic" Converter - 3" Inlet/Outlet
$179.95

* per here: http://www.provenperformanceconcepts.com/products.htm

 

[Dimitrios]

Good info Dimitrios (2thumbs)

Reply from Burns Stainless..a nice simple reply:


Yes.

-----Original Message-----
From: Dimitrios
Sent: Friday, January 07, 2005 3:22 PM
To: 'vince@burnsstainless.com'
Subject: Mazda downpipe (with high flow cat)


Vince,

I'm a member over at www.protege5.com. Recently, there have been some efforts (we have a thread going here: http://www.msprotege.com/forum/showthread.php?t=86150&page=1&pp=30) to fabricate a naturally aspirated downpipe that retains the OBD II emissions gear, but also gains some power. Our goal is to fabricate something like: http://www.msprotege.com/forum/attachment.php?attachmentid=32091

That pipe contains a 5-bolt flange on top of the cat, the high flow cat (obviously sourced elsewhere), a transition (to a 2.25" pipe) and then a 90-deg 2.25 capped by a flange on the end.

Would it be reasonable to assume that using one of your transitions and 90 pipes, we'd be able to replicate such a part? If so, expect some orders.... J

Thanks,
Dimitrios

 

[xelderx]

Subscribing...and bump.

 

[rktktpaul]

Subscribing...and bump.

What Justin said.

Bump.

 

[Subghetto]

Well guys I was crusing the forums and found this website that Ghostwhisper was telling everyone about it's where you design and machine your own part I'am going to play with it a bit to see what I can come up with but I suck at this sort of thing if any of you have some skill I would really appreciate it if you can give it a try. thanks

Here is the site to DL the software for free- http://emachineshop.com/

 

[fLyPiNoY7]

pretty much anyone with a basic knowledge of CAD can design one of these...

 

[Subghetto]

Yes, we are going to do a J-pipe.

We will be doing the J-pipe real soon.We are waiting on our flanges to come in.

Guys!!! I read this in another thread hopefully Beau will make one just like the wagner one but at a more reasonable price. Yes finally it was just a matter of time . I can't wait to see the progress on this.

 

[Mental Addiction]

we are going to be manufacturing 2.5" J-pipes.We are waiting for the flanges to come in from the machine shop.

 

[SIBalla23]

I have two quick questions, will you be making a j pipe with a high flow cat? And what would be a rough estimate for the price of one?

 

[Mental Addiction]

I have two quick questions, will you be making a j pipe with a high flow cat? And what would be a rough estimate for the price of one?

The J-pipe does not have room for a cat.The J-pipe connects to the stock Pre-cat and the Midpipe.

 

[NJP5Guy]

you guys should make a header with highflow cat integrated that'd be so sweet.

 

[Subghetto]

The J-pipe does not have room for a cat.The J-pipe connects to the stock Pre-cat and the Midpipe.

Beau do you think you can make it with a hi-flow cat mabye later on that won't throw a CEL that would be awsome.

 

[fLyPiNoY7]

dammit...should i wait for this or get a wagner catless downpipe from a forum member?...

 

[fLyPiNoY7]

(bump)

 

[blueprotegelx]

i'd love to get a j pipe from mam...their awesome and great to work with! i live in a county where emissions are not checked. they don't care here. haha. so i'd like to go catless. what exactly should i look into? i just got a racing beat rear axle put on today....just lookin for some help on my catback. i'm not worried about the header yet...i'd appreciate the help guys! sorry to jack the thread or what not...