I am in the process of street tuning my built GSR setup and have come across a couple issues.

1st: I am running a hood exit exhaust, my tuner feels that an extender pipe must be ran to give an accurate reading of AFRs. Another friend of mine who tunes said that by running the pipe while tuning, it will throw the tune off once the pipe is removed....


2nd: While tuning we noticed that my AFR's would not drop below 12.0 under boost, no matter how much fuel was added ect. Tuner thinks its a software issue, other friend thinks my injector deadtimes are off


Anyone else have any opinions?

 

The exhaust changes would be minimal at best, have you setup your injector scaling and latency? sounds more like user issue more than software, but anythings possible.