Evening everyone, I recently had a question that despite my research can’t find a definitive answer online and was wondering if the infinite wisdom of these forums might lend an insight into it.
My xr6 turbo has been tuned a few years ago and since then I have deleted the factory middle muffler (dual in/dual out) with dual straight pipes, keeping the rear muffler in place and have no issues whatsoever with air/fuel ratio.
I now am curious about whether I add a straight through muffler (dual in/dual out) at the rear instead of the chambered factory one, whether this will cause any leaning out without a retune?
it still has factory dump/cat.
opinions?