about to buy a new test pipe to put on my 2000 1.8t a4. I just got a 2.25 inch cat-back borla exhaust system. Im seeing a lot of different sizes from 2.25 inches to 3 inches for the test pipe and im not sure what is best. I've read that if the change in sizes between the turbo and exhuast isnt right it could lead to preformance loss. Does anyone know what pipe i need? pretty sure i want to go ecode everyone ive seen has their test pipe.

 

http://www.audigeeks.com/forums/index.php?topic=1871.0


this company makes exhaust items for the rs4 and s4, and now they do 1.8ts

http://www.tripleplate.com/forum/sho...9774#post39774

 

my car is a b5 a4 i believe those pieces were for a b6. also i have the tip trans if that makes any difference at all.

 

"eurocode" test pipe then

 

i guess i could have linked these earlier but this is where my confusion lies

the differences between these 3 test pipes. aside from the price. they are all said to fit my car.
http://www.ecodetuning.com/shop/cart...p=671&c=18
http://www.ecodetuning.com/shop/cart...p=370&c=18
http://www.ecodetuning.com/shop/cart...=1123&c=18