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Old 06-20-2011, 11:42 AM
dtw dtw is offline
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Just brought 99' f-350 7.3 diesel

Need some advice on preformance mods for my pickup truck. Truck is used to pull 40' long goose neck (triple axle) enclosed car trailer. Will be going out west (Arizona and CA) from St. Louis with a full load of two cars and assorted stuff this fall.

I want to look at preformance mods to increase power.

Engine has 110,000 miles and appears to be stock. No problems with engine or transmission.

I also would like any recommendation for repair shops in St. Louis area that can install modifications.
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Old 06-20-2011, 03:32 PM
JEL JEL is offline
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The first things I'd do are the good old reliable intake and exhaust upgrades. I have an AIS on my truck and I recently installed a 4in turbo-back MBRP with the muffler (catless) and feel those two things helped my turbo spill a wee bit quicker and maybe a little top end when pulling up hills on the freeway. They are a good starting point before going to tunes IMO. After the basics are out of the way, you'll want some guages to monitor your engine before getting into custom tunes.
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Old 06-20-2011, 07:07 PM
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Hello local guy. Might want to head over to SLAPS Homepage and join up there. As for a local shop, MCS diesel in Eureka is about the best in the area, but kinda pricey for me, I'm a cheap-*** and do most of my work myself, anything I couldn't do myself was done at a SLAPS mod day. \

There's no way you should pay a shop to install an exhaust, intake, or chip...those are super easy. I did my exhaust myself in an afternoon, the DIY intake takes 20 mins.
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Old 06-20-2011, 09:05 PM
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As stated intake and exhaust mods to start. Most people use the Napa 6637 intake. It is a DIY intake and is inexpensive compared to others and is better in most peoples opinion. Second I would do a 4" turbo back exhaust with no cat or muffler. When I did this mod i felt a HUGE difference, not to mention it sounds AWESOME. Then I would get some gauges to monitor what is going on. I would get a pyro to monitor EGT's, a boost gauge, and a trans temp if it is an auto. Once you have the gauges then i would go for a tuner. I just got my DP Tuner and it was like I bought a new truck. Better fuel mileage, more power, just everything is better. Also if you have an auto I would get a 6.0 trans cooler to help keep it cool. All of these are fairly inexpensive mods that will make a huge difference in power, lowering EGT's and increasing fuel economy. Hope this helps.
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Old 06-21-2011, 03:08 AM
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Where you are going to be towing, I would start with Transmission mods... A 6.0 transmission cooler and a BTS or John Wood Valve body would be a good idea. (I don't tow much, so I held off on those.) The 4R100 is really the only weak link in these trucks.

Next step would be Gauges... EGT/Pyro, Transmission Temp, and Boost are the most common.

THEN I would look into performance: Intake, Exhaust, (4" Turbo back or a 5" w/ 4" downpipe), and lastly a CUSTOM tuned chip...

Will turn the truck into a whole 'nother animal!
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Old 06-21-2011, 03:52 AM
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spot on!

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