There's a guy here with '04 Acura TL 6-speed manual and got good intake and exhaust. You may want to check them and do some research as he's very impressed with them: KN Intake kits - Acura TL Tanabe Medalion Touring Cat-Back - considered most quiet with good performance
2. ATLP Base stage 2 exhaust - bit quiet but roar loud when you step on it
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