Adding a different muffler will give your Acura a high performance sound in addition to increased airflow. There is a large range in quality in these type of products.
Buying from a well known manufacturer will ensure a good fit and high quality.

 | UNIVERSAL BLACK CATBACK MUFFLER EXHAUST TIP TURBO SOUND PRODUCER WHISTLER KIT $36.00
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 | Acura CL Honda Accord Complete Cat Back Exhaust Pipe System Muffler for L4 $164.90
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 | 3.5" OUTLET SPORT RACING DEEP SOUND AXLE BACK TWIN LOOP DESIGN MUFFLER EXHAUST $36.99
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 | JDM 4" N1 SLANT TIP EXHAUST MUFFLER SUBARU IMPREZA WRX 2.5RS EVOLUTION LANCER $30.90
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 | Walker 18562 Direct Fit Muffler $67.09
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 | STAINLESS CAT BACK EXHAUST 4.5" TIP MUFFLER 90-93 ACURA INTEGRA DA5-DA9 DB1-DB2 $115.68
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 | Universal N1 Stainless 3" DTM Dual Slant Burn Tip 2.5" Inlet Muffler $44.99
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 | 2002-2006 ACURA RSX TYPE S N1 CATBACK EXHAUST MUFFLER SYSTEM DC5 DC-5 03 04 05 $107.95
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 | UNIVERSAL FIT BOLT-ON EXHAUST MUFFLER TURBO WHISTLE SOUND /NOISE DEVICE SIMULATOR $8.94
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 | UNIVERSAL 4" BURNT TIP N1 EXHAUST MUFFLER HIGH FLOW w / SILENCER SS $26.95
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 | 4 inch 4" Universal Stainless steel Exhaust Muffler N1 $29.99
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 | 3" OUTLET DTM DUAL TILT SLANT TIP MUFFLER EXHAUST w / 2.5" INLET $31.95
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 | UNIVERSAL MUFFLER TURBO SOUND KIT HONDA CIVIC SI LX EX S200 INTEGRA PRELUDE VTEC $9.50
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 | ASPEC ITB 2.5" TIP 2.5" INLET SPOON STYLE SUS304 STAINLESS UNIVERSAL MUFFLER JDM $89.95
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 | 02-06 Acura Rsx GReddy muffler chrome tip Type S only street legal CARB wear $112.50
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 | 5.5" OVAL OUTLET 2.5" INLET TIP STAINLESS STEEL HIGH FLOW N1 EXHAUST MUFFLER $37.95
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 | Yonaka Acura Integra 94-01 Performance Catback Exhaust Muffler WS2 JDM USDM 2DR $239.00
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 | 3.5" OUTLET TWIN LOOP SPORT RACING MUFFLER EXHAUST ACURA CHEVY DODGE FORD HONDA $62.99
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 | INTEGRA DC5 K20 CATBACK EXHAUST PIPE MUFFLER 4" TIP +5-BOLT TURBO DUMP /DOWNPIPE $168.15
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 | Acura Honda S JDM Real Carbon Fiber Tip Black Track N1 Weld On Muffler Silencer $39.99
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 | INTEGRA DC5 BASE K20 SS 2.5" INLET EXHAUST PIPING CATBACK 4" BURNT MUFFLER TIP $113.05
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 | 94-01 INTEGRA GSR DC2 HATCH 3 DOOR STAINLESS EXHAUST CATBACK 4.5" MUFFLER TIP $109.25
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 | DC SPORTS 3.5" SLANT TIP STAINLESS STEEL MUFFLER EXHAUST ACURA HONDA CHEVY $42.50
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 | INTEGRA DC5 BASE K20 STAINLESS 2.5" INLET EXHAUST PIPING CATBACK 4" MUFFLER TIP $121.60
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 | INTEGRA DC5 TYPE-S STAINLESS 2.5" EXHAUST PIPING CATBACK 4" MUFFLER TIP +SILENCER $119.70
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