Well i was thinking, the mazda6 has the 2.3 with dual exhaust and the 3 has single with a shorter distance to travel. I assume the stock piping is 2" or so. I am gonna go with 3" pipe all the way, Should it still be just about the same flow area as the 6's exhaust? It should free up a few horses and my friends are having a dyno day shortly and i want to have it done to do some numbers.
EDIT: As always, topic heading for clarity
NOTE: Usually 3" is not enough
EDIT: As always, topic heading for clarity
NOTE: Usually 3" is not enough