For towing with stock or mildly modified engines, we suggest sticking with a 3.5" down-pipe. It will give you quicker spool up and better low end power. Here is a link to our budget kits. Let me know if I can help with anything.
Thanks Smokey!!!
Exhaust Systems | 99-03 7.3L Power Stroke | Ford Power Stroke | Diesel Power | Performance Truck Products