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All Flowmaster system for that truck I found were really a single exhaust. I got the 2.25 in/out with tailpipes out each side, cause that is what my wholesaler had in stock(impulse buying you know). If you want dual tailpipes, Flowmaster makes an American Thunder with 2.25 tailpipes out each side, or two 2.25 pipes out one side. The other system is a 3.00 out the pass side. None are any better for performance then any other. You will find a decent performance gain, and a mileage improvement. The Flowmaster system was the best mod I have done to my truck from a performance standpoint. You will find it a little loud if you pull a trailer at highway cruise, and if the engine lugs a little, it tends to echo a bit, but I really have no regrets
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98 GMC Sierra Ex Cab, cowl hood, Euro LED lights, 30 bar billet, Whipple Supercharged 350 Vortec: Forged flattops, E-Tec aluminum heads, Comp Cam, Scat crank and rods, Granatelli Mass air flow, Headers, Flowmaster exhaust , Complete MSD Ignition, Custom Tuning, intake spacer , ported throttle body, AC Delco port injection upgrade, Roller Rockers, Power Pulleys. Gear Vendors Overdrive. Soon to hit a dyno. 2/4 drop(for now).
95 Chevy S-10 Ex Cab 4.3 5 Speed 2/3 drop, Euro lights, billet grill, More to come. The Daily Driver
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