Straight Piping
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you can have problem sputting a 4" downpipe on a 6.0 -- some have gotten them in with little to no problem, some have to beat the firewall in a little...
it comes from the factory with a muffler and 3.5 all the way back, so he's not gonna hve too much backpressure -- the backpressure comes from the turbo anyway...
plus it could have a high-flow muffler on it ...
and you are correct, a 4" will flow more freely
it comes from the factory with a muffler and 3.5 all the way back, so he's not gonna hve too much backpressure -- the backpressure comes from the turbo anyway...
plus it could have a high-flow muffler on it ...
and you are correct, a 4" will flow more freely