I currently have a stock 09 wrx with a drop in filter. I was thinking about getting a turbo back exhaust and engine tuning.
The exhaust is the Invidia Q300 cat back and then either the Invidia downpipe or the mac autosport downpipe. I'm located close to parker, so that's why I was thinking about mac to install this stuff and then get an open source tune there.
I was wondering how well you think open source tuning works? Also how is the mac autosport downpipe considering that I haven't heard to much about it? What is the main difference between a catted and non-catted invidia downpipes? Plus for some reason mac autosport was telling me that they wouldn't install a non-catted downpipe. Do you know of another place that would install a non catted downpipe with an open source tune? Would any of these downpipes pass emissions?