I just wanted to know if I replace my stock cats with a hi flow ones, or with test pipes, is it a must to have an ECU reflash?

Here in Spain there is not a posibility to reflash the ECU for a 350Z, and if I have to do it, I would not be able to replace my stock cats. And that sucks me...

Thank you very much.

Which one you recomend me?, hi flow or test pipes?

 

No

 

order the pro-1 test pipes from E-BAY... very good quality and value...
i'd suggest test pipes over high flows just because less striction = more power and less weight = more power...
so...

 

you can re-flash your ecu...send it to AAM or Technosquare in the US..they will flash it and send it back. If you think you might want to do that, post here again for more info..