MBRP makes nice diesel exhaust systems too. I have one of their 4" straight pipe systems on my '01 Cummins and love it. Easy to install, fits great, and sounds good.
You really need to be making a lot of power to need a 5" exhaust system over the more common 4".
I agree w/ the K&N comments too. Don't waste your money.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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