Upgrading to the 42DD pipe saves 11 lbs.

This is the stock 225 downpipe and cat section, about 27 lbs.

<img src="http://images42.fotki.com/v1314/photos/4/41970/6671517/DSCN9811-vi.jpg">

This is the street version of the 42DD downpipe kit, about 16 lbs.

<img src="http://images39.fotki.com/v1236/photos/4/41970/6671517/DSCN9717-vi.jpg">

 

thanks for the weight update!

 

nice!!!

 

Good to know that this mod also adds "lightness". Thx, Marty.

 

"must resist, must resist 42DD DP, must resist"

 

oh.just do it...LOL

 

And the TTQC goes to the body shop next week finally. Had to scrounge cup wings!

Wait til next month!

 

If so, I'm ready (already own a reciprocating saw).

 

My words: Maybe, maybe not. The issue is the higher flow cats and how the Oxygen sensor readings are affected. Some are fine, some need to add a spacer to take the post-cat O2 sensor out of the exhaust flow to get accurate readings and avoid the CEL. There are a couple of sources for the spacer, <a href="http://public.fotki.com/mcphill/audi_stuff/engine_and_drivetrain/o2-sensor-spacer/">one is MCPi</a>, and the other source is Wayne Schmidt at wayne92SLC@yahoo.com.

42 Draft Designs FAQ
<b>What kind of cat are you using on your street series downpipes?</b>
We are using a Magnaflow high-flow cat. It uses a 400 cell ceramic catalyst. The honeycombs are not interwoven, they are straight through in design. Magnaflow catalytic converters offer a lifetime warranty and have been proven to be incredibly reliable.

<b>Will your downpipe cause a CEL?</b>
Race series downpipes WILL cause a CEL.
Street series downpipes MAY cause a CEL.

We have had a 75% CEL success rate with our catalytic converter choice. None of our local test vehicles using our street series downpipe have reported a CEL. We have found that 25% of our internet customers have reported a CEL with the street series downpipe. Race series or street series, the CEL can be avoided by using an angle block adaptor on the second oxygen sensor.

<b>Is there anything I can do to avoid the CEL?</b>
Yes, there are a number of oxygen sensor simulators on the market which attempt to solve the CEL when running a high-flow cat or no cat. There are both electrical and mechanical devices. We have never seen an electrical oxygen sensor simulator used successfully on a VW. We have seen mechanical devices used successfully. Because the function of the cat is mechanical in nature, we feel a mechanical solution to the problem is more likely to work than an electrical solution.

In order for the CEL to not illuminate the ECU needs to see altered readings from the second oxygen sensor. The readings needs to be slower in frequency and overall less than the first oxygen sensor. This can be achieved by pulling the nose of the sensor out of the stream of gases. It is important to get this just right. If the sensor doesn't see enough gases a new code will be thrown. If the nose is not pulled far enough out the readings are barely affected.

Wayne Schmidt has developed a fitting to solve the CEL problem. His fitting has been thoroughly tested and is running on hundreds of VWs with a stellar success rate. Pictured below, this fitting installs in place of the second oxygen sensor and relocates the sensor outside the flow of gasses. The sensor is installed at a 90° angle to clear the heatshield and ground. The fitting is CNC machined from 303 and 316 stainless steel, guaranteed to last forever and is a completely reversible modification. Wayne's fittings are available by emailing him directly: wayne92SLC@yahoo.com. (42 does not sell this fitting, please contact Wayne directly for pricing and availability)<ul><li><a href="http://www.42draftdesigns.com/faq.htm#18tdps">http://www.42draftdesigns.com/faq.htm#18tdps</a</li></ul>

 

mine ran for 2 months before the CEL came on - the spacer trick worked fine.