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Re: V-10 Y-pipe
I modified mine by cutting the stock Y pipe off just below the O2 sensors. I ran dual 2.5 inch pipes back to where the cat use to be, Yes I deleted the cat. The exhaust shop fabricated a custom Y where the two 2.5's combined into one 3, the custom Y then ran into a Flowmaster 70 series muffler. The throttle response was much quicker, the RPM spooled up real quick. A slight increase in Hp was also noticed, but the low end torque shifted up the RPM band. Not good for towing. Now the bad part, the thing was so loud you could not ride in it. After 15 minutes I had a headache so bad my eyes were crossed. I went back and re-installed the cat which quitened it down quite a bit. Now it has a V-6 on steroids sound. [img]/ubbthreads/images/graemlins/frown.gif[/img] The throttle response is still btter than stock, the low end torque is up in the RPM band, and it sounds horible. MPG's may have increased slightly, maybe .3 or .4 MPG. I'm at the point now of not knowing what to do. Since I already have the dual pipes back to the cat I may go ahead and run duals all the way to the back. I know a guy over at FTE who is running this set up with dual Magnaflow's, with a "H" pipe, and he is getting good results. -OR- Go with Banks or Borla headers with the Flowmaster cat back system made for diesels. This would allow me to do away with the 3 inch pipe and go with 3.5 or 4.0 inch pipe. If you don't tow you may want to accomplish this mod, if you tow this mod is not good because your low end torque is really moved up in the RPM band.
Mark
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2000 F-250 Super Duty XLT V-10 4x4 Ext Cab SWB. Ram Air Mod with K &N filter, Sonnax Valve-Tricumulator Springs. Hayden 679 Tranny Cooler with Imperial fan. Trans. Temp. gauge, BFG 285-75R16 All Terrain T/A's
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