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Pacesetter also makes a header. They are the same price as Clifford Perf. but they include a 2 into 1 "y" pipe if you want to go with a 3in. single exhaust.
unless youre really willing to go thru a large hassle, try to avoid the cliffords, from what ive seen, theyre customer service isnt up to spec. may have changed by now, but use them as a last resort.
the 1987+ 300's used a dual-out cast-iron dual manifold, if you have a carby engine, its a cheap upgrade, they flow decently well.
hedman's are about $136 from summit, jcwhitney has pacesetters, but the hedmans i know are dual outlet. they may take a little grinding to fit right, but they'll outflow the efi manifolds.
i think hedman and dynomax make 300 headers. I am looking a Hooker super comps though. They look to be the highest quality from what i can see. last i checked i think they were around 300 dollars from JEGS.
Hooker supercomps are around 340ish I think. I ordered them from Summit. They seem the best, equal length, and have thicker inside pipe diameter (1 5/8") compared to hedmans 1 1/2". The collector with an o2 sensor port's price really suprised me. I think they were around 60.
I saw hedmands for like 140 on summit and jegs. Dont waste your time on Clifford, they could overprice lug nuts and windsheild wiper fluid.