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Originally Posted by ILoveDieselVans
A friend of mine who owns a sizable auto repair shop and a 6.0L van with 4x4 conversion told me that he was unable to figure out how to replace the pipe that comes out of the turbo and drops down (down pipe?) due to space constraints with the dog house engine cover.
He did successfully do a cat delete and replace the remaining pipes with 4". I drove it a couple times, and it's a slight big louder in normal driving but a lot louder at the top end if you stomp on it.
I'm interested in doing the same for fuel economy reasons, despite the fact that he thought he got only a very small mileage increase...not enough to offset the cost.
I also read on a forum somewhere that increasing the exhaust diameter without making some corresponding changes with a tuner would actually result in decreased mileage and performance. Can anyone with experience speak to this?
My mileage went down when I installed a cat delete/test pipe and high flow muffler. My 65rwhp economy tune was written by Eric at Innovative Diesel which I installed around the same time. More recently, I installed an Atlas40 tune when I had the FICM rebuilt. I don't have exact numbers but seems like my mileage is now in the 13-15 range compared to 16-17 prior to the mods. On the plus side, EGTs are 150 to 200 degrees lower and I have tons more power. There might be some truth to changes in tune being required with an exhaust mod.
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05 E350 4x4 6.0 99k: DC Power XP250A, Dieselsite coolant filter, ELC coolant, IPR GEN2 EGR delete, KCturbo Stage 1.5, updated turbo drain tube/oil feed line/STC fitting/OEM oil cooler, cat delete, high-flow muffler, SCT Tuner with IDP Xstreet tune, PHP Atlas 40 FICM tune, Blue Spring, billet fuel filter cap, BPD water pump, Scanguage II, AutoMeter fuel pressure and pyro gages, Tru-Cool Max 40,000 GVW transmission cooler