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squid · 02-20-2003, 10:03 PM

I have a set of JBA 1 1/2 unequal shorties I will be putting on in the next couple of weeks. I cant wait to see how they do. I think alot of people are running too large a diameter header. If you have high flowing heads and .550 lift cam I could certainly understand it, but for a street stang with iron heads and under 325 engine HP it doesnt seem to make that much sense. 1 5/8 would probably give you a minor HP increase above 5000 rpm but may sacrifice just as much in torque. 1 3/4..now your talking about some serious HP to fully utilize this diameter. What do you guys think?

02-20-2003, 10:03 PM	#5
squid Registered Member Join Date: Sep 2002 Location: Dayton, OHIO Posts: 73	I have a set of JBA 1 1/2 unequal shorties I will be putting on in the next couple of weeks. I cant wait to see how they do. I think alot of people are running too large a diameter header. If you have high flowing heads and .550 lift cam I could certainly understand it, but for a street stang with iron heads and under 325 engine HP it doesnt seem to make that much sense. 1 5/8 would probably give you a minor HP increase above 5000 rpm but may sacrifice just as much in torque. 1 3/4..now your talking about some serious HP to fully utilize this diameter. What do you guys think? __________________ 93'GT 5spd. Underdrives, FMS clutch, adjustable quadrant,Flowmasters, Kenny Brown subframe connectors, 3.73 gears, Steeda Tri-Ax. JBA shorties, BBK h-pipe. More to come.