This is an observation only. Yesterday I replaced the stock air filter with one from Amsoil - what a difference! First the turbo whine is significantly louder - sounds like music to my ears. Second, the truck seems to respond better both in acceleration and smoothness. I'm not trying to push any brand but this filter is a winner.
I probably shoudn't mention this since I don't have all the facts but Amsoilman2 (Danny) having the same truck as I do, except it is a 3500, had a problem with low power and poor fuel mileage. Cummins did a couple of dyno checks and changed some parts and the truck still had the same problem. Anyway, Danny changed the stock air filter to the Amsoil equivalent and his 'same trip' mileage went from 15 to 19MPG instantly! Seems that his original air filter was over oiled thus restricting the air flow. This could explain the problem that a lot of ETH owners have been having. If it does explain it - it's an inexpensive fix.
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Stan
2001 2500 SLT+ Quad Cab, 6 speed, ETH, 4X4, LWB, 3. 54 LSD Trailer Tow, Camper Special, 241HD, Tow Mirrors, Bright White, Line-X Bedliner, Putco Boss SS running boards, A. R. E. K Series Truck Cap, Reese Titan V Hitch, 2WD Low, DD 4" exhaust, BD exhaust brake, Isspro Boost and EGT gauges, Mag-Hytec rear cover with Amsoil Series 2000 75W-90 synthetic, Amsoil Dual-Remote Cummins Oil Filtration System (full-flow & by-pass); Practical Solutions Boost Module/Elbow; Amsoil 2 Stage Air Filter
I probably shoudn't mention this since I don't have all the facts but Amsoilman2 (Danny) having the same truck as I do, except it is a 3500, had a problem with low power and poor fuel mileage. Cummins did a couple of dyno checks and changed some parts and the truck still had the same problem. Anyway, Danny changed the stock air filter to the Amsoil equivalent and his 'same trip' mileage went from 15 to 19MPG instantly! Seems that his original air filter was over oiled thus restricting the air flow. This could explain the problem that a lot of ETH owners have been having. If it does explain it - it's an inexpensive fix.
------------------
Stan
2001 2500 SLT+ Quad Cab, 6 speed, ETH, 4X4, LWB, 3. 54 LSD Trailer Tow, Camper Special, 241HD, Tow Mirrors, Bright White, Line-X Bedliner, Putco Boss SS running boards, A. R. E. K Series Truck Cap, Reese Titan V Hitch, 2WD Low, DD 4" exhaust, BD exhaust brake, Isspro Boost and EGT gauges, Mag-Hytec rear cover with Amsoil Series 2000 75W-90 synthetic, Amsoil Dual-Remote Cummins Oil Filtration System (full-flow & by-pass); Practical Solutions Boost Module/Elbow; Amsoil 2 Stage Air Filter