I have the pypes dual set up with an x-pipe and street pro mufflers. This setup is pretty similar to the FRPP kit. I didn't really feel much of a gain with my dual exhaust. On the highway it felt like the car pulled just a little bit harder towards the top of its power band. My guess is around 5-7 rwhp gain.
< Message edited by Silver Vert 06 -- 4/25/2008 4:19:28 PM >
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2006 Mustang 4.0 Convertible -Satin Silver -Auto -Pypes True Duals w/ x pipe and Street Pros -C&L Cold Air Intake -XCal3 w/ Bama tunes Waiting for paint and installation: -GT takeoff front/rear bumpers, sideskirts, grill/fogs
HP gain is probably minimal but I brought it for looks and its made by Ford for the Mustang so EVERYTHING fit right the first time. Made with quality materials, easy to install and sounds great.
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White 2005 V6 coupe w/automatic. FRPP M5230V6 dual exhaust. Vmp 93 mileage tune w/Vmp cai. Shaftmasters 4 in. driveshaft. 8.8 posi-rear w/3.55s. 17x8 in. black FRPP Bullitts w/Pirelli 235-55s. BEST 1/4 MILE TIME -- 14.65@93.58 (4/16/08)
Posts: 226
Joined: 11/24/2007 From: Wittmann, AZ Status: online
It's not very much, duels are mostly for looks on the 4.0 unless you are going with a SC or Turbo. Pretty much any extra hp you get from duels over a single, with a good muffler, no V6 stock hunk of junk will be negated but the extra weight of the system. Hope this helps.
A little more low end torque with the X pipe and better exhaust gas scavenging but unless its paired with a good CAI and a tune, its mostly a sound upgrade.
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What is the average HP gain for the FRPP dual exhaust s... - 
