exhaust
#1
#2
#4
It was either BullyDog or Expandit, I can't remember which. Of course when I was looking ti was almost two years ago, so the prices may have gone up since then. Your best bet is to ask for a quote on this website (there is a section for it) and vendors will PM you with what they have and the price. If memory serves correctly though, it was 'LukesDiesel" who had that price.
#9
Yes, some aftermarket systems come with a 4" downpipe. Rip at sourceautomotive, sells a 4" downpipe by itself as well, or you can get a full 4" system from him. That being said, if you have a stock turbo, or even an HX35, a 4" downpipe won't matter, as the turbo still has a 3" outlet. I'd wait to get a 4" downpipe, until I got a turbo with a 4" outlet.
#10
Yes, some aftermarket systems come with a 4" downpipe. Rip at sourceautomotive, sells a 4" downpipe by itself as well, or you can get a full 4" system from him. That being said, if you have a stock turbo, or even an HX35, a 4" downpipe won't matter, as the turbo still has a 3" outlet. I'd wait to get a 4" downpipe, until I got a turbo with a 4" outlet.