i recently installed a dual apexi n1 turbo se... but my exhaust guy asked me if i wanted to delete my cat ? my question is if i delete the cat would my check engine come out due to sensor or there no sensor's... btw its the 2005 tl 5at. btw deleted mid muffler plus 2.5 all the way into a 3' y pipe.

 

No I don't think you should get any errors.
I've replaced the 3rd cat with an ATLP race-pipe. No issues thus far.
Other members have 'pre-cat deletes' with a race-pipe/hi-flo-cat.

It's all good in the neighborhood.

 

its all good in all of our neighboorhoods!!!!!

 

Why did you go to 3" rather than going down to 2.25" which would flow much better?

3" causes droning and kisses bye bye to the backpressure, not to mention low end torque

 

If I get the XLR8 cat back and J-pipe with the test pipe where the 3rd cat is will it be alright to leave the other 2 cats OEM on my 06 TL manual? I don't feel like spending a fortune, just want a little more HP/Torque. Also considering the V2 Accord intake and an RU pulley, but having a 500watt rms sub with a 1.5 farad cap I am not sure about which pulley to get?

 

the rv6 precats are actually pretty cheap...