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Old 06-16-2005, 04:26 PM   #1
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Exhaust questions

Gonna put a set of headers and hi flow xpipe on my 02 gt. Is this emissions legal in CA? I will be moving to CA this summer and need it to stay legal. Whats the difference between shorty's and equal length? Is it worth the extra cash for equals?
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Old 06-16-2005, 04:44 PM   #2
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shortys are legal and if you keep the stock NUMBER of cats it will be legal too. you CAN have hi flow cats
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Old 06-16-2005, 06:05 PM   #3
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I like my ford racing shorty headers however the BBK equal lenghts have proven a little bit more bottom end..
FRPP shorties = ~1-2 HP and lb-ft loss bottom end on dyno but above 3500 RPM gained a peak of 7 HP and 6 lb-ft, no SOP difference personally but I somehow almost broke 100 MPH at the track with just those and a short throw shifter

however they did improve the sound, big time
I have a stock exhaust setup and I've had people come up to me ask what I've got done to the exhaust..
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Old 06-16-2005, 08:53 PM   #4
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people ask me what header/mid pipe/cat back I have on my 88 lol..i just now put my o/r h in today and headers are sitting next to me in the basement. I guess they are used to the usual 2 chamber sound and not 1 chamber muahaha
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Old 06-16-2005, 09:20 PM   #5
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From all reports I have seen and heard its a real pain in the rear to install headers on a 4.6L Mustang. I dont' have a thing on mine but stock manifolds, a Mac H with 2 high flow cats and a 3" Cobra Ford Racing Catback, I would not want it to be any louder, I couldn't stand it myself if it were. I have actually thought about switching it to a 2.5" catback because it is so loud.
Rick Kilpatrick, AAS Automotive Systems Tech, Alamance Community College, Class of 99. 06 5 speed manual Mustang with Pony pkg : GT Mac Mufflers, true duals with one custom pipe. 2.5" system. GT bumper cover, all installed March 7&8 2006. AFE Stage 1 CAI, Motoblue Underdrive pulley, GT aluminum shifter knob, honeycomb rear blackout panel,and dash kit installed. Roush hood scoop and side window louvers installed. SS taillight trim has been installed, new alum. GT steering wheel installed.
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Old 06-17-2005, 01:41 PM   #6
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it is a major paint, but can be done... probably be easier pulling the motor up a bit or droping it down.
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