Cheap/no cost upgrades

[nc1500]

I can't find anything dealing with this. Does anyone have a comprehensive list that I can start with or point me in the right direction? I drive a 2000 4x4 7.3/automatic.

 

[bushpilot]

check some of my links

 

[fgtex]

The zoodad mod for more air to the filter is a freebie. The DIY tymar is a $50 or less replacement air filter mod that will yield more air in. Replace the stock muffler with a Walker BTM for about $50 will help your exhaust flow better, or lose the muffler all together (check your local laws first).

 

[MBRPCrazyford]

what exactly is the 10k mod?