This is a very short run!!
my wrx only has up-pipe & down-pipe and still factory cat-back!
I was driving around 40mph in highway this morning. One black G35 coupe with loud exhuast tried to pull up hard and pass me. Then I knew he want to play with me. So, I speed up and follow him. We did couple time from around 50mph to 90mph, I can still kept the same distance and he couldn't walk away from me!!
At least now, I have an idea that I can beat those G35 or 350zx with AP stage2 in next couple month!!!