*New Product* MAP Integrated O2 Housing / O2 Eliminator Downpipe for Evolution 8/9
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We do not have this option as of yet, but it is in the works
Guaranteed not to rub anything
We do not have this option as of yet, but it is in the works

Last edited by maperformance; Nov 14, 2008 at 09:57 AM.
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From: Cottage Grove, MN
Very cool piece. I'm looking forward to seeing pictures of the recirculating version. I've always wanted something like that; it seems to me that the direct-replacement O2 housings just don't go far enough.
I'm a little concerned about the possibility of different thermal expansion between the turbine outlet pipe and the wastegate outlet pipe on a recirculating version, and it makes me wonder if a slip fit section like AMS uses on their recirculating turbo kits would be a good idea.
I worry about the difficulty of the install, too: I know you've said it's easy, but I've installed an O2 housing, and it's much harder than installing a downpipe. Way too many projects begin with "remove the undertray and downpipe to get clearance", so it's not just a one-time install.
Have you considered a two-piece version, with a flange just before or after the downpipe turns to run parallel to the ground? That'd make removing the horizontal portion of the downpipe even easier than stock, and it might make it easier to incorporate the wastegate slip fitting that I mentioned above, though I'm sure it'd bump the cost up.
I'm sorry, this is all coming out sounding negative. I really like the look of this product. I'm not willing to put up with a wastegate dump and I've never been happy with the sacrifices that replacement O2 housings have to make to mate up to stock and stock-replacement downpipes. I like your ceramic-coated mild steel approach as well; I agree that it should provide all the protection from corrosion that you could ever need while offering less thermal expansion.
I'm a little concerned about the possibility of different thermal expansion between the turbine outlet pipe and the wastegate outlet pipe on a recirculating version, and it makes me wonder if a slip fit section like AMS uses on their recirculating turbo kits would be a good idea.
I worry about the difficulty of the install, too: I know you've said it's easy, but I've installed an O2 housing, and it's much harder than installing a downpipe. Way too many projects begin with "remove the undertray and downpipe to get clearance", so it's not just a one-time install.
Have you considered a two-piece version, with a flange just before or after the downpipe turns to run parallel to the ground? That'd make removing the horizontal portion of the downpipe even easier than stock, and it might make it easier to incorporate the wastegate slip fitting that I mentioned above, though I'm sure it'd bump the cost up.
I'm sorry, this is all coming out sounding negative. I really like the look of this product. I'm not willing to put up with a wastegate dump and I've never been happy with the sacrifices that replacement O2 housings have to make to mate up to stock and stock-replacement downpipes. I like your ceramic-coated mild steel approach as well; I agree that it should provide all the protection from corrosion that you could ever need while offering less thermal expansion.
Last edited by maperformance; Nov 14, 2008 at 09:56 AM.
Thread Starter
Former Sponsor
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From: Cottage Grove, MN
There should be no restriction or power loss as it a full 3" pass through. The factory O2 housing + downpipe configuration utilizes a ball style connection to absorb the stresses of engine movement. As we have eliminated that connection here we chose to use this SS flex section to absorb those stresses and increase longevity even though it significantly increases our cost of production. There are some downpipes on the market that utilize a flat flange connection and do not incorporate a flex section as we have here and that just flat out scares me in regards to how long those can possibly last...
There should be no restriction or power loss as it a full 3" pass through. The factory O2 housing + downpipe configuration utilizes a ball style connection to absorb the stresses of engine movement. As we have eliminated that connection here we chose to use this SS flex section to absorb those stresses and increase longevity even though it significantly increases our cost of production. There are some downpipes on the market that utilize a flat flange connection and do not incorporate a flex section as we have here and that just flat out scares me in regards to how long those can possibly last...




