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If you're going to run through the cat and mufflers all the time, don't waste your money on the long tubes, the shorties will work just as well on the street. I recently bought some stainless steel Edelbrocks with the new Ti-tec (powdered titanium finish ) for about 300 bucks.

Running through mufflers you can expect 10-15 additional road horsepower (remember, your truck probably doesn't produce more than 150 hp at the rear wheels).

Biggest headache for most people is keeping the header gaskets from blowing out at the head and/or the collector. You need to tighten them regularly until they take a "set", or find a good, experienced installer who will perform this follow-up work as part of his service.

Biggest advantage of headers with the new ceramic coatings is greatly reduced underhood heat. This greatly lengthens the life of wires, hoses, belts, etc.