Join Date: Mar 2009
Location: Salem Oregon
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A good rule of thumb is 1" per 100hp
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