i just put new tru duals flowmaster 40 series on my 2005 f150. i was wanting to know what it would do if i put new headers on? would it make my exhaust louder? thanks

 

yes, louder, and with longtube headers some good horsepower & torque gains.

 

ALOT of people experience low end loss with high end gains with headers, depending on the application. if you decide to get headers, spend the extra money and get some ceramic coated. people will tell you there isn't a difference. BS, there is a BIIIG difference. the heat dissapation from the ceramic coated is UNREAL. I put the ceramic coated ones on my truck. put 50,000 miles on there and they still look like they did when i first put them on (no discoloration or anything)

 

If your going to do headers, do long tubes. High flow cats are a good combo as well. Its most likely one of the "best bang for your buck" as far as horsepower/torque gains goes. Very noticeable in overall "feel" of the power gain as well. Your exhaust will get much louder indeed. Especially if you have an after market exhaust system or straight pipes.
___________________

06 Silver F-150 XLT 5.4
K&N Air charger Cold Air Intake Kit, Airaid Throttle body spacer, 3 1/2 Cat back straight pipe exhaust w/ Chrome tip placed in front of back tire, 6-Disc MP3 player, 13.5" JL Audio Subwoofer, Ported Custom-Built Box w/ matching carpet to int., JL Aud Amp 500 RMS, 1 Farad Cap, 4 gauge JL Aud Wires , 150 Amp JL Aud Fuse, K2 360o Radar Detector, Chrome billet front grille, 20" Bruzer,275/55/20 Pirelli Scorpions