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Old 12-20-2002, 02:27 PM   #1
mark25
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Join Date: Feb 2000
Location: Vassar,Ks 66543
Posts: 375
Will it be enough????????????

getting new exhaust put on my truck with my new, fresh rebuilt 402 BB. my question is, will 2.25" exhaust be enough????? the muffler shop says that 2.5" pipe is very hard to get around the trailing arms, and can get very thin after making some of the tight bends. this is a fairly stock motor with maniflods, a 396/350 HP crane cam, stock cast iron intake and a fresh rebuilt OE q-jet. what ya all think???????????? BTW, am going to used magna flow mufflers, how do they sound?????????
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'72 C-10 Cheyenne Super, 402/TH400, Bucket Seats, tilt, tach, AM/FM & shoulder harnesses and a ground up restoration
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Old 12-20-2002, 04:00 PM   #2
crazy longhorn
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Join Date: Jun 2002
Location: Ill
Posts: 9,402
2 1/4 " pipe should be plenty on your 402. as a thought, you might opt to run 2 1/2 from the eng to the muffs, & then go 2 1/4 out. The shop is right on,the bends on 2 1/2" pipe over the axles will tend to crush the pipe to the point that you wont gain any flow. I think you will like the magnaflows, they have a nice deep rumble at idle /cruise & a heathy roar when the throttle is opened. Good luck...crazy AL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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