I been looking on other website I even talk to a few people and can't figure this out.

I'm in the middle of building up a LS/VTEC Automatic. Here is the thing I'm OBD2. I just have a couple of question I have.

1. I'm thinking to upgrade the piston to USDM ITR just to bump up the compression up a bit (I did the calculation thru C-Speed website). Will I have any problem passing emission?

2. Greddy e-manage Ultimate. Is the software straight foward and will be good for my automatic application?

My main concern right now is passing emission since i'm obd2 and since I have a JDM SIR-G auto ECU and wondering if what well happen if I stick the stock LS ECU back in for emission will I throw a check engine light?

 

why dont u 5 speed swap it while ur at it?

 

No. I'm trying to be different from every one else. Don't get me wrong I been driving manual for over 14 years and every one is telling me to do a manual swap but my goal is to be original and converting my teg from usdm to JDM auto SIR-G. It's pretty much all converted or I have everything getting ready to install.