are there any performance gains with a cat-back
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This is a discussion on are there any performance gains with a cat-back within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; will i notice any improvement at all with a cat-back 3"pipe? or is it purely sound ?...

  1. #1
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    are there any performance gains with a cat-back

    will i notice any improvement at all with a cat-back 3"pipe?
    or is it purely sound ?

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  3. #2
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    it's mainly for sound. u might see a gain of 5hp at the most but will never feel it.

  4. #3
    Registered User mudferret's Avatar
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    As above, gains are marginal. My car was much faster afterwards however since I was on the throttle more so I could hear the rumbly goodness.
    ...Rob.
    MMVI WRX - VF43 Airboy Tuned @ 3500'

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    cheers guys .,
    think im just gona put the system i have on to cat back until i have the money to remap then put the rest on ,

    its a 3" system ,.will it match up with the standard flanges ok ?im presuming this is what everyone does?

  6. #5
    Registered User teflon_jones's Avatar
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    Yup 3" is standard and it'll mate up fine.
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
    '04 Porsche 911 Turbo GT2 clone 600 HP/TQ
    '77 F-150 heavily modded for off-roading

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    thanks ,do ineed to use some gasket paste or just the gasket alone ?

  8. #7
    Registered User Pavia's Avatar
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    You'll need new gaskets...
    06 GTO M6 Quicksilver, SLP 455 Bobcat, LS7 Clutch w/ SS line (RPM tune:373rwhp/373rwtq)
    07 WRX TR M5 Garnet Red Pearl w/ Straight PPGs and Cusco front LSD (Agile tune:307whp/343wtq)

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