Does a testpipe automatically give you a check engine light?

 

yup, it'll take a few weeks but you'll get one. but you can do the anti-fouler mod or angle block to get rid of the CEL

 

Can you explain more about the anti fouler and angled block?

 

http://forums.audiworld.com/s4/msgs/2239514.phtml
here is another good pic
http://www.audizine.com/forum/showthread.php?p=1789315

 

i have an angle block for sale, PM me if u want it...

it pulls the rear o2 sensor back out of the exhaust a little so it doesnt sense as much air flowing through... tricks the computer

 

https://www.audiforums.com/m_732015/tm.htm

 

there's a guy on audizine right now selling longer anti-foulers, so you could buy one of those or the angle block from papachristou, personally i would go with the angle block. i haven't seen a cel since i put mine in