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Join Date: Nov 2012
Location: Yuba City
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A cat will be the biggest whistle killer.
I say don't put a muffler on unless you want to get rid of the full throttle v8 sound when your going full bore.
Throw a cat and leave the muffler off and the sound is only really loud when you floor it.
I was trying to get my turbo to whistle so when I bought the 03 one and had it out on. Inwas heart broken to hear barely any whistle... So removed the cat and muffler. But I might put cat back on too because of whistle but I'll leave muffler off and suggest you do the same for great sound and minimal whistle
currently-1999 F250 SBRB 4X4 7.3, 6.0 trans cooler, 08 mirrors, AIS Intake.
-2004 F350 CCLB 4x4: Sinister Race solutions kit, CAT ELC Edge CS, SCT SF3, PHP Ficm programmer, Procomp, Rough country, and Nitto goodies.
-2004 excursion, banks exhaust, 03 turbo, aem intake.
-2006 f350 king ranch, aem intake, 10 in fabtech, 40in tires, sct tunes.
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