Originally Posted by Courtesy Flush
The pypes headers are what i wish i went with, even with all their bad rep with fitment and quality. Seen quite a few guys running em and making good power. Stepped header design 1 5/8ths stepped to 1 7/8th into a 3 inch collector.
Best of both worlds? could be.
Wouldn't know as i went with the 1 7/8th SW setup personally, very exotic sound with these headers when you creep into the top of the rpm band.
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Pypes are complete and total junk! I have only successfully installed one set that actually fit without modification, and that was today on a 3v mustang. I have tried a set on almost every mustang out and not a single set was even close to fitting correctly.
1 7/8 is the only way to go on the new 5.0's. anything else will be leaving power on the table. With these new 5.0's they make so much power so efficently, that they need all the help getting the air out they can. I highly doubt that on the same day and same conditions if the 1 7/8 lose any hp or tq at any rpm to the 1 5/8. Keep in mind, even though they are only 302 ci, they move a tremendious amount of air!