most aggressive? straight pipes, all the way...drone in the cab is rough through 1st and 2nd gear...hit overdrive and it's no big deal...if you run straights watch the size of the pipes...tried mine first with 2 1/2, lost lots of low-end...went back and had them swith to 2 1/4, all my power is back...had mine run with 3 1/2" X 18" slash-cut tips, cost me $150. out the door...sounds great and looks pretty good,good luck, Rich. too

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-1999 F-150 4X4 XLT SC
-4.6, auto
-3.55LS
-Westin chrome nerf bars
-dual straight pipes
-hikerdadrich@aol.com

 

def. go with strraight pipes i had my factory y pipe cut out true duals ran straight pipe and 5 inch chrome tips it sounds great and looks awesome
thanx
jj

 

Whoa, 5 inch tips?!? Man, I didn't know they existed. Do you have any pics? And where'd you get them from?