paulandrew1417

have modified 408 lq4 with hot cam ported polished heads and nos need 1 7/8" primary headers that direct fit.

paulandrew1417

anybody no where to get headers for a modified engine

Vortec350ss

iTrader: (20)

GM FULL SIZE 6.0L / 5.3L / 4.3L TRUCK 1999-2006

If you will be redoing the exhaust I would recommend going with the 5.3 Y pipe set up and a 3.5" single outlet. The dual system is nice, but one of the pipes goes down to a 2.5" right as it connects to the cat back, and all that could be avoided with the Y pipe system. with the power you'll be pushing a 3.5" single exhaust would be nice.

GMCtrk

iTrader: (27)

I agree completely. ARH is the way to go. Direct fit 1 7/8 which is what I run, and agreed on the 5.3 Y pipe over the 6.0 dual version. The dual version has that nasty neck down before the stock catback. The Y pipe version is full 3" and has a very good Y on it.