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post #1 of 2 (permalink) Old 03-31-09, 09:39 PM Thread Starter
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5.4 f-150 exhaust

i have a 2003 f-150 4x4 5.4 with straight pipes but wanna put headers , high flo cats , and one chamber race flowmasters. and also custom computer programs? any suggestions

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post #2 of 2 (permalink) Old 04-04-09, 10:35 PM
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Re: 5.4 f-150 exhaust

I have a '01 that I did the same to. The right manifold rusted through. I ended up going with the Pacesetter full length headers, and one universal cat per side. The only downside was that I had to heat up the left header tube and dent it in a little to make it clear my front driveshaft. It really gave the truck a lot more power. The scrapyard basically paid for my parts by buying my old crossover with stock cats. The headers ran me $285 and the 2 cats were $55 each. The cats sold for $375, and after I put the headers on, I had another $110 in custom piping done by a local shop. I already had a Y-pipe from where the muffler was cut out after I first got the truck. They just cut the Y out and tied into the rear pipes.
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