I have a 78 f150 with 351m. It has stock everything (except dual saddle tanks) and I want to know what is the best route to go with headers and dual exhaust. I have been told to use mandrel bent tubing.. Any suggestions on brand for headers and exhaust. How much would I expect to spend for headers, new tubing and exhaust?

 

Unless you will be running it on the track, you don't need mandrel tubing. Don't get me wrong, it is better, but the area that makes it better will only be experienced on the track. That will save you some money since it all has to be fabricated anyway. So long as the gas tank isn't in your way, true duals would be great, but if the tank is int he way, might as well run a dual outlet muffler and just run a single from the front to the muffler. Its less expensive, flows just as well if not better, looks just as nice, and doesn't need X-pipes or H-pipes to balance the sound.

 

Summit has Hooker headers for $189.95 and a true dual exhaust kit from Hooker for $169.95. You'll need mufflers too. 2.25" diameter is just right.

 

I'm providing the all the Hedman info for 4WD Dents so you all can share with other members as the need arises.

Tel: 562.921.0404
Fax: 562.921.7515
Email: sales@hedman.com

Applicability:
4WD 1/2 & 3/4 ton pickup, F-150, F-250, F-350 (Light Duty Only)
....
Years: 65-76
Engines: 352-390
Headers:
Painted - PN 89120
HTC Coated - PN 89126
Elite or Stainless - PN 89830
Applications:
A/C - Yes
P/S - Yes
Transmissions:
Automatic Column Shift - Yes
Automatic Floor Shift - Yes
Standard Column Shift - Yes
Standard Floor Shift - Yes
Footnotes: 4, 6, 138, 166 (3/4 - 1 ton only)
4 = Includes parts necessary to retain emission devices (50-state)
6 = Modify stock exhaust to retain catalytic converter
138 = Will not fit Camper Special or vehicles with front sway bar
166 = Will not fit multi-shock absorbers, factory or aftermarket installations.
Emissions: C, G
C= For vehicles 1964 through 1974 without A.I.R. systems, considered as O.E.M. replacement parts when existing emission controls are not removed from vehicle.
G= 1975-1976 only, 50-state legal for these years only.

.....

Years: 77-79
Engines: 351-400M

Headers:
Painted - PN 89360
HTC Coated - PN 89366
Elite or Stainless - PN 89868

Applications:
A/C - Yes
P/S - Yes

Transmissions:
Automatic Column Shift - Yes
Automatic Floor Shift - Yes
Standard Column Shift - Yes
Standard Floor Shift - Yes

Footnotes: 6, 41, 45

6 = See above
41 = Fenderwell exit
45 = Not legal for sale or use in California on pollution controlled vehicles.

Emissions: B, D

B= Not applicable or intended for street or highway use. Legal only for racing vehicles whichmay never be used upon a highway.
D= Not legal for sale or use in California.

..........

Years: 77.5-79
Engines: 351-400M

Headers:
Painted - PN 89210
HTC Coated - PN 89216
Elite or Stainless - PN 89218

Applications:
A/C - Yes
P/S - Yes

Transmissions:
Automatic Column Shift - Yes
Automatic Floor Shift - Yes
Standard Column Shift - No
Standard Floor Shift - Yes

Footnotes: 4, 6, 44, 166

4 = See above
6 = See above
44 = Will not fit Dana 60 front differential
166 = See above

Emissions: L
L= 1977-1979 only, 50-state legal for these years

*****************
If you wanna save ALOT of money then learn how to weld... around here, the total cost is around double of what parts cost.