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greg,
i know nuttin but understand that 4" downpipe will hurt vs. help unless yer goin for big hp. low end losses at that size. 3.5" better per research. no direct knowledge so you prolly know better'n me.
Will want a 3.5" when i do 4" exhaust but will stik w/ oem air cleaner as mines a 6L and supposedly best filter vs breather for all around perf. and use. good luck!
whats this box van doin to deserve all the goodies?
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2004 E450 Cutaway, 6.0L, quigley 4x4, ambulance pkg., maxbrake controller, curt 20k fifth wheel. Future mods: 52" sleeper, tandem (6x6?) rear (aint look'n likely  ), frame cover. maybe a Herd front bumper.
2003 F350 Lariat, 4x4, CC, SRW, Dark Green Fx4 SOLD
1995 C3500 6.5l work trk, 2x4, CC, DRW, white DECEASED PREMATURALLY
2003 JEEP WRANGLER, ooooops, not anymore!
1986 26' Seaway Northstar w/ 454 Mercruiser
2008 Montana Mountaineer 332PHT
1991 GMC Topkick, CAT, 4' vert. gang boxes, 12' dump. if only all were as reliable!
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