I'll admit straight up I'm not much of a gear head. The only modification on my truck right now is the Flex-a-Lite electric fan kit. Anyway, I've been reading around and decided to add a flowmaster 40 series muffler to my truck. After I get it and take it to a muffler shop and get them to put it on, is there anything else I should ask them to do, to help with performance? My trucks more of a daily driver than offroad vehicle.

Also this probably doesn't belong in this thread, but my Truck is a 91 4x4 3.0, that's about the pass 150,000 miles. Never had any problems, had to replace the radiator that leaked, but that's it. Any tips on how I can keep her running as long as possible?

 

ask em for an estimate on how much custom made headers would cost. and to keep it running, make sure it doesnt overheat(head gaskets on the 3.0 arent the greatest) change oil religiously, and dont go speed racer on it. those things alone should help out a lot

 

You'll be fine. I've got over 200K on my 3.0 still runs like a champ, and gets 18-19MPG....