They ran a single 3" straight pipe out right behind my side steps. From what I understand, anything over that size is overkill
That's what I've always heard...at the same time, geneluo on here (doesn't post regularly, but he's around from time to time) has a Hypermax Pulse turbo with a 2.5" downpipe going to a 5 inch sewer pipe exiting in front of the rear wheel. I don't have any video clips of it (not sure if I even have pictures, although I think towcat does), but it sounds MEAN!! Hardly any crackling/rapping/? (I can't think of the right word for the life of me) at higher RPM's that you hear with 3" and even 4" systems...just a deep rumble that almost sounds like a freight train, with the turbo whistle on top.
I'm not a fan of in-front-of-the-tire exhausts, and I can't find a 5" tail pipe assembly for the life of me...RPM Outlet used to sell a 5" assembly for the OBS PSD crowd, but they seem to have discontinued it (
this is as close as they get now, but if I'm reading the description right, it's a 4" system with a 5" tip), and I can't find anyone else selling one. I'd like to get the tail pipe assembly, a piece of straight pipe to connect to my downpipe, and then get a cheapo muffler and put it around the straight pipe... "I don't know why my exhaust is so loud, Officer, you can see the muffler right there!"
(not that I've had any trouble even with my current 3" straight pipe, but can't be too careful)...
BTW I ran my truck with just the downpipe for about 4 years after installing my turbo...the noise in the cab was LOUD!! By comparison, with all of my windows closed, the cab noise is about the same as it was when the truck was naturally aspirated, with the 3" straight pipe exiting the stock location...I don't know how David7.3's setup compares in terms of noise...
Also, if anyone's interested, this is how my truck sounded with just the downpipe...this was back in 2006...
http://www.youtube.com/watch?v=3UoB-tW5B44