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The more free-flowing the exhaust is the more likely you are to hear the popping. So, replacing the restrictive factory cats with high-flow cats (or removing the completely, although this is not always street-legal) as well as using high-flow mufflers (or, again, no mufflers) will allow you to hear the pops better.
Apart from this, you can also get the engine tuned to create pops by having the fuel injectors continue to inject for a time after the throttle closes, although this is purely for sound and can actually reduce performance.
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Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts
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