ordering 2015 wrx: STI performance exhaust upgrade?
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This is a discussion on ordering 2015 wrx: STI performance exhaust upgrade? within the Car Purchasing Forum forums, part of the ClubWRX.net Marketplace category; Hi, Planning to put my order in for 2015 WRX. Anyone know the difference (dimensions or performance) between the stock ...

  1. #1
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    ordering 2015 wrx: STI performance exhaust upgrade?

    Hi,
    Planning to put my order in for 2015 WRX. Anyone know the difference (dimensions or performance) between the stock and "STI Performance Exhaust Upgrade"?

    Thanks!

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  3. #2
    Registered User frenziedcage's Avatar
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    There isn't a difference. One makes noise the other doesn't.

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    Thanks for the reply. Kind of hard to believe the only difference is sound. The thing cost $1100 MSRP and is marketed as "performance upgrade". I understand its shinier than stock and has bigger tips. Maybe has gradual bends or high-flow mufflers?

    Anybody have a '15 wrx and knows the diameter of their intermediate pipe?

  5. #4
    Registered User frenziedcage's Avatar
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    If we are talking about just a catback exhaust, then yes its just for noise lol you might gain 5-10hp with it but nothing you will notice. CBE isn't doing anything for gains really now if you swap your downpipe out for a new one you could notice significant gains.

  6. #5
    Registered User wreckingball man's Avatar
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    If it's anything like the SPT exhausts of the past there's no real performance advantage. Just sound.

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    Quote Originally Posted by wreckingball man View Post
    If it's anything like the SPT exhausts of the past there's no real performance advantage. Just sound.
    i talked to the dealer and saw it , and it is different. the point where the two mufflers join into the single pipe from the motor is much bigger. on the stock on , the connection isnt 3"+ -- the SPT is larger and therefore opens it up quite a bit.

    dealer is saying that the mufflers are different and not as restrictive either - so there is some difference other than noise.
    i have seen many good reviews, and i will get more info this wk as i am ready to buy this so i will get the full details.

    the mandral-bends are different as is the connection point i talk about - i looked at it then looked at my stock one as they were changing the oil.

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