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salesman375 05-02-2005, 02:34 PM what are some simple mods to do on a 99 powerstroke diesel?it already has a straight pipe and k&n filter. any help would be greatly appreciated. also it shifts to overdrive early what is a fix for that too? thanks shawn ToddPSD 05-02-2005, 06:09 PM First take the KN filter out. Lets way to much dirt in. Get a tuner and raise you shift points a little. Go to Diesel Innovations for your tuner. They will give you the best and safest power around. Maxium4x4 05-04-2005, 08:37 AM I agree with Todd on the air filter. You only see an increase in HP at Max Rpm's using a K&N filter. Dirt is what you want to keep out of your system. Try running your hand inside the intake tube to see how the previous owner kept the truck. Upgrades for your transmission http://www.suncoastconverters.com/ | ||