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Re: Manifold or Headers, H or X pipe, muffler brand
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Originally Posted by FatherandSon
1. Most headers available are 1 1/2" tube. A Super Chevy article indicated a 1 5/8" tube is best & can produce up to 16 hp but larger tubes drain low end torque. GMPP says 1 3/4" is best. Does the 1/4" or 1/8" make much difference?
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That's nuts for them to say 1-3/4" is best for that engine. Both 1-1/2" and 1-5/8" will work better. 1-1/2"may give you more spark plug & boot clearance.
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2. A lot of posts on this board indicate a strong preference for stock manifold over problems w/headers. Will I notice the increase in hp w/headers or be wasting my money?
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I'd say your rams horns will work great with that engine. I pulled some troublesome headers off my 69's mild 383, and went back to my angled 2" rams horns. Gotta say I didn't notice any seat of the pants power difference. Properly sized headers always help a little throughout the power band, but can be a PITA depending on how well they are made.
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3. Several posts indicate a preference for X pipes over H pipes for sound quality but some indicate this may reduce low end torque by reducing back pressure. Which is best?
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Back pressure increases torque just like cheeseburgers make your heart healthier. 
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4. Which mufflers? Are Magnaflo & Flowmaster worth the price or is there a quality lower cost option?
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IMO, both of those will be very loud, except for maybe the long case 70-series Flowmasters. Dynomax long case Super Turbos are quieter and cost less.
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Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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