By the time you spend the money on the PLOG, ported rear manifold, and the what you spent on the Downpipe, you could of afforded headers. I wouldnt bother with a the PLOG and ported rear manifold. Save up $200ish and buy a set of Speed Daddy headers. They go for roughly $225 brand new on eBay, and you might be able to find a used set for even cheaper. Sell the downpipe you have when the time comes to help afford it. You could still easily get $60+ on it.
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97 GTP Sold-prolly rusted away by now
2011 F-150 Yote powered
Too Hot to Handle, Too Cold to Hold