I know that this is a common topic around here, and I have read many of the other posts on exhaust systems for the V6. Not sure that I have come to a conclusion on what is best for my truck though.

I have a '03 F150 Supercab XLT Flareside with the 4.2V6

I want to put a flowmaster 40 series original system on my truck.

Local muffler shop quoted me $290 for a SI/DO system with chrome 3.5" tips with a 40 series original flowmaster and for a SI/SO system with my existing tailpipe (and the above muff) a much cheaper $109.95.

I am willing to fork out the big bucks if the duals are exceptionally louder than the single out.

Any advice would be great. Thanks.

 

The 40 series original flows are one of the louder mufflers on these trucks. I have the 50 series Delta and that thing is even getting annoying! It's just a matter of taste. I also am going to be upgrading to a stainless steel system sometime this summer. I'm kicking myself for forking over $350. without asking others on the boards, here. Of course I did this mod when the truck was still new (2001), so it was a while back. Nothing is wrong with flows, it just has to do with personal taste.

 

Went ahead and had the SI/SO 40 original installed this morning. Used factory pipes with the side exit behind rear tire.

Sound isn't very loud. It rumbles when cranked and that's about it. I do notice better acceleration though.

Think I'll add a 3.5" chrome tip coming out the rear for better looks and hopefully better sound.

 

Hi-

It will definitly get louder! Just wait for teh carbon to build up and the muffler to break in!

 

Just use the factory pipes with a tip other wise there is no point, they will still be the 2.50" pipes just at a 45deg angle if you want. And yes the exhaust will get louder, i had the 40 series and it got LOUD after about 2 weeks now I'm on the 50 series because of all my towing.... it still has a nice sound, but either way flowmaster and i would stick with the factory pipes unless you like to spend money for no reason