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July 2001
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Exhaust Power Test
Adding 23 Rear-Wheel Horsepower
Text And Photos By:
David Freiburger
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Sources
MagnaFlow Performance Exhaust, Rancho Santa Margarita, CA
800/990-0905, 949/858-5900
www.magnaflow.com
Mr. Gasket, Cleveland, OH
216/688-8300
www.mrgasket.com
Sanderson Headers, San Francisco, CA
800/669-2430
www.sandersonheaders.com
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Looks better, sounds better, runs better. What more could we ask? OK, this particular hop-up was a bit pricey at $1,047, but we're really happy with the results. We started with the '31 Model A roadster we tested last month-it's powered by an aggressively average 350 Chevy with typical bolt-ons like an Edelbrock Performer intake, a JET-tuned Quadrajet carb, and ACCEL ignition. The idle was cruise-night lumpity thanks to a single-pattern Lunati cam with 0.457-inch lift and 268 degrees of advertised duration. It ran great, but seemed choked by stock exhaust manifolds and 2 ¼-inch dual exhaust with blown-out turbo mufflers. After 25,000 miles on the combo, the roadster was ready for some more snap.
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In addition to a full line of various muffler styles, MagnaFlow sells mandrel-bent, stainless steel tubing kits that you can cut and weld to piece together your own custom exhaust. There are 2 1/4-inch and 2 1/2-inch kits in the catalog, but the company will custom-make kits in tubing sizes up to 4-inch.
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