last night i did the diy exhuast brake and tested it this mornning.on a good size hill,at the top to the bottom with no brakes on, of the go pedal i dropped 5-6mph from just reg.engine brakeing.same hill and speed with the diy exhaust brake on i lost 17 mph from the top to the bottom.with the exhuast brake on and light brake peadl i lost 25mph.this was done with a empty 75000 lb truck.i would expect to see more exhaust brakeing when loaded.i will be takeing a run down south in a week to p.u. a load of car's.i will be running about 19k on the way back.i will post the result's when i get back.i have the ebpv valve on a switch that i filp when i want it to turn on.so far i would say it was worth the $15 in part's and 1hr to do the install. 
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it's MY story and i can tell it anyway i want! 2000  F-350 7.3psd cc shorty 4x4 with intake,dp-tuner stock 40tow 80econ 140hp 5f switch mounted on the gauge pod, apiller tripple gauge's, trans temp,egt's,boost, tranny rebuilt with tugger shift kit,hd conv.,borg warner kit,4'" exhaust from the stock down pipe,5er and gneck hitch's in box,class five reciver out back,fire stone air bag's controled by a load controller on rear axle,onboard aircomp. under hood,2 2.5 gallon tanks under bed,air coupler in alum tool box in bed for tires etc....285/75/16 coopers, pioner jl adiuo kicker sound system,150,000 and going strong,psd's rule!87 f-250 6.9 4x4 auto bank's turbo ,4'' exhaust.soon to come, intake, ip and injecter's.installed a wrecker bed with wheel lift and recovery winch's
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