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Thread: Ibanezz's project journal

  1. #551
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    it does depend on the whole setup i suppose. I know my borla plus no cat had a lot more rasp when i shifted gears than it does now with the HF cat. only when my exhaust is cold i do hear it. but i could just be picky. Of course TD has been proven to cut more rasp out than anything else.

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    If you have someone build you a Y pipe with a flow master merge it will significantly decrease rasp. A lot of the guys on the ls forums do this.

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    The y pipe is where a lot of the rasp comes from, header design plays a role too. Its all about the way the pressure pulses hit eachother. Rasp on ls cars with a y pipe gets a lot worse with long tubes and no cats.

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    93 Firebird M5 [RIP]
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    98 NBM Camaro Z28 A4 [LS1]

    Mods: slp lid, borla adjustable catback, transgo kit, 3.73s, spohn tubular A arms..

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