Hey guys, I recently purchased a 99 si from a friend. It has the b16a2 with gsr cams swapped in. Also, he has a gsr ECU hooked up (37820-p72-a01), my question is, should i leave it alone or should i hook up the stock 99 si ECU that he gave me on the side? BTW, this is my daily driver and I am more interested in reliability and fuel economy then speed... Thank you

 

Why in the world would someone put a GSR ecu on a B16?

Use the SI ecu.

 

Not sure, I'm still new to the tuning scene...but I shouldn't have any trouble putting on the Si ECU considering the small mods my engine has, gsr cams, short ram intake, buddy club cam gears, skunk2 intanke manifold?

 

In that case, ideally have the car tuned. Running a chipped p28.