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agreed, the 550 horse and above is pretty much true, ive asked many guys at shops and they basicly said 5inch is just braggin rights, i am redoing mine with 4.5, but, thats cuz i got 40ft for free and mine doesnt look so good with a 6ft chunk of 4" SP spliced in where the stock muff. and cat was. my 4inch is pretty loud as it is when i get on it, the 4.5 is slightly thicker by 1/8th inch as its electrical EMT. sometimes the cheapest stuff is just as good as the expensive stuff.
05 2500,6spd, 12" lift, 41" IROKs, 20x12 KMC rockstars, cust. long arm in front, trac. bars in rear, willys intake, J/A, 8k HIDs, open grill, HOK orange. 58 chev wagon, 83 yota wheeler, 04 440ex, 7mill banshee, mazda minitruck, 90 toy 4runner, 05 sv650s
Had a 4" free flow and upgraded to a 5" turboback with muffler and its relatively easy on the ears. Egts are obviously lower, you can her the turbo alittle more too. I didn't notice too much of a loss on my low end, but its noticeable that I have... I like the sound, deeper and smoother than my 4". Also you hear less turbo chatter..
If you are comcerned about drone in the cab do not even think about 5", I have a 05 quad cab short bed and it was loud as S@#t. I tried everything to get my wife to ride in it, Silverline 5", Magnaflow muffler, Aeroturbine, all claming they would help with the drone but nothing did. I ended up trading everything I had to go back to a stock system minus the cat. The 5" did sound like a freight train which was cool but hook up to a trailer and tow and try to have a conversation, good luck!
2004.5 Automatic, 2" leveling kit, Silverline 5" Exhaust, Bully Dog Triple Dog Programmer, K&N Cold Air Intake, ARB Topper!
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