xr4tic

<center><img src="http://www.supersprint.com/immagini/marche/76/prodotti/761012.jpg"></center><p>Diameter size? Type of material?

QRS has it listed for $222. Seems kinda pricey, so is it worth it?

I'm planning on installing a high-flow cat and putting it under the car, so some sort of test pipe would be nice for an easier install.<ul><li><a href="http://www.supersprint.com/English/marmitte.asp?MO=auda411&MA=76">http://www.supersprint.com/English/marmitte.asp?MO=auda411&MA=76</a</li></ul>

A4orce CJ

Yeah there are two o2 sensors on the A4. If you take out the cat and put in a test pipe the check engine light comes on. There may be a work around...anybody know of one? **Disclaimer** Not that I'm condoning the use of a test pipe for street use

xr4tic

Have your chip modified to ignore the code, or since I'm adding a high-flow cat, install the second O2 sensor after the high-flow cat under the car. The S4 and A6, and probably others, have their second O2 sensor under the car as well.

I guess there is a 3rd option, create a simple voltage emulator circuit that emulates the O2 sensor voltages. Data-logging with a VAG-COM would give you a good idea of how to emulate it.

SMOKINA4TURBO

Most software tuners will not do any exaust mod. due to strict emmisions laws.