No that's my buddies STI. As for Welding up a custom header I fear in the rear if went bigger would run out of room immediately just like if bought a aftermarket one. It's tight by firewall.
Would I see any gain from getting a crossover pipe that would bolt to stock (does that exist?) and the plog for the front.
Thanks for all the spark plug information everyone! Much appreciated.
As for how far from motor the wideband should be? Any insight? Just want to make sure I get the most accurate reading possible.
