I was looking at ebay today and saw somebody selling the greddy exhaust for the v6 mazda 6. I have the 4 banger but wanted to see how much of a diffrence would it be to put that exhaust on my car the piping looks similar to the 4 bangers setup . Has anybody tried to see if we can interchange the exhaust ? And if so how much if any work is needed. Thanks for any info .