when you buy one of those programmers to increase torque hp ect do you have to leave it plugged in or run it and then take it off, and if you can take it off can you program more than one car

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You plug it in, add the tune, then unplug it.
They are VIN locked, so that you can only tune 1 vehicle at a time. If you wanted to tune another vehicle, you would have to return the first vehicle back to the stock tune.

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2008 RAM 1500 Sunburst Orange QuadCab BigHorn. 5.7L HEMI w/MDS 5-Speed auto
20" Chrome wheels, WOL Tires, U-connect, auto dimming mirror, adj. pedals, 3.92 Anti-Spin, Tubular side steps, Chrome bug shield, Sirius radio and spray in bedliner.

are they worth the investment, im not too worried about like little gas gains and whatnot but in the overall picture is it worth dropping the couple hundred on that as opposed to other things

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shift timing improvement itself is worth it for many people. dollar for dollar, programmers are about average for hp increase. the diagnostics, datalogging, and scanner function that some of them have is really invaluable at times.

i got a superchips 3815 i'm lookin to get rid of, pm me if you're interested.

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04' 1500 QC SLT 4x4 HEMI
Magnaflow SI/DO
Infinity w/ Pioneer MP3 deck

I had a Diablosport Predator on my 01 F150 5.4L and noticed a decent power gain in 93 octane mode. It also gained almost 2mpg which outweighed the $.20 a gallon difference.
It greatly improved the shifts as well as removed the power drop (throttle modulation)when shifting. The diagnostics were great as was the live data logging. Whenever they finally release one for the Hemi trucks, I'll be getting one.
In my opinion they are worth the money.

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2008 RAM 1500 Sunburst Orange QuadCab BigHorn. 5.7L HEMI w/MDS 5-Speed auto
20" Chrome wheels, WOL Tires, U-connect, auto dimming mirror, adj. pedals, 3.92 Anti-Spin, Tubular side steps, Chrome bug shield, Sirius radio and spray in bedliner.

^^^ +1....I loved my predator and it's great for troubleshooting your car/truck. Even if you have heavy mods (cam, FI, etc) you can get a custom tune through diablosport emailed to you....very handy.

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-07 2wd RCSB 5.7-
Magnaflow muffler..Airaid Intake Tube

I have SC 3815 and I love it. it shifts alot better and has alot more power now

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05 dodge ram daytona RCSB 4x4 hemi #5212
99 dakota 4x4 318 - sold
88 dakota 2wd 3.9
90 dakota 2wd 3.9 rcsb 5speed
93 jeep grand cherokee 4x4

I have the 3714 which is specific to the 03 hemi only and I will not part with it. Makes me enjoy driving the truck even more.

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2003 Ram Quad Cab
Hemi Sport Laramie
Debadged
Nerf Bars
Superchips 3714
LineX Bedliner
DJM Drop Shackles
Magnaflow 2.5 duals out the back