Syms Downpipe vs Decat
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  1. #1
    50bhp 3G Impreza
    Join Date
    Jul 2011
    Posts
    78

    Syms Downpipe vs Decat

    Heard a full set legal exhaust of a friend GRF STI recently which consists of Syms downpipe and midpipe with Corazon muffler. Was surprised that it didn't sound different from my friend's decat stock downpipe with Corazon muffler. I thought that 3 inch downpipe will be louder?

  2. #2
    10bhp 3G Impreza
    Join Date
    Apr 2014
    Posts
    21
    Your downpipe also decatted ?
    Else the exhaust flow should lose to a stock decatted downpipe

  3. #3
    50bhp 3G Impreza
    Join Date
    Jul 2011
    Posts
    78
    If I am not wrong, the syms downpipe comes with a racing cat.

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  5. #4
    25bhp 3G Impreza
    Join Date
    Apr 2012
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    44
    Yes, you are not wrong.... lol

  6. #5
    10bhp 3G Impreza
    Join Date
    Apr 2014
    Posts
    21
    Erm. Racing cat is not the same as no cat.

    For it to be LTA compliant, it is still a cat that restricts exhaust gas, just slightly lesser.
    If it is free-flow, then the cat is pretty pointless right.

    So the decat pipe will still be louder due to more flow.

  7. #6
    10bhp 3G Impreza
    Join Date
    Apr 2014
    Posts
    21
    Oh yah. If a Decat and High-flow/sports/racing cat can provide the same flow, i dont think anyone will want to
    Decat for $100 + $500(fine per time) and always be afraid of TP
    vs
    Racing pipe $900

    excuse the pricing, just estimations.
    Have you considered Total Bypass valve ? LOL

  8. #7
    25bhp 3G Impreza
    Join Date
    Apr 2012
    Posts
    44
    Quote Originally Posted by unfair View Post
    Oh yah. If a Decat and High-flow/sports/racing cat can provide the same flow, i dont think anyone will want to
    Decat for $100 + $500(fine per time) and always be afraid of TP
    vs
    Racing pipe $900

    excuse the pricing, just estimations.
    Have you considered Total Bypass valve ? LOL
    Bro, the racing pipe will still be illegal , decat not so obvious (visually) compared to a racing pipe.

  9. #8
    50bhp 3G Impreza
    Join Date
    Jul 2011
    Posts
    78
    Is a legal 3 inch syms downpipe....

  10. #9
    50bhp 3G Impreza
    Join Date
    Jul 2011
    Posts
    78
    Quote Originally Posted by unfair View Post
    Oh yah. If a Decat and High-flow/sports/racing cat can provide the same flow, i dont think anyone will want to
    Decat for $100 + $500(fine per time) and always be afraid of TP
    vs
    Racing pipe $900

    excuse the pricing, just estimations.
    Have you considered Total Bypass valve ? LOL
    Bro what is a total bypass valve????

  11. #10
    10bhp 3G Impreza
    Join Date
    Apr 2014
    Posts
    21
    Quote Originally Posted by rexkia View Post
    Bro what is a total bypass valve????
    Just kidding with you bro.

    I'm referring to a side port exhaust / Side Plant.
    The pipe simply goes from engine down then to the side, instead of routing all the way to the back. No resonator / cats in the way.

    Can also be have side plant + normal exhaust, toggling to side plant when racing.
    Totally illegal but loud as XXX.

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