Yes, you need an EM for engine mods - Page 7
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This is a discussion on Yes, you need an EM for engine mods within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; It'll be just fine. If you are genuinely concerned.. Call COBB to double check...

  1. #91
    UnBanned Sinister's Avatar
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    It'll be just fine. If you are genuinely concerned.. Call COBB to double check
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  3. #92
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    You mentioned pre-06 WRXs and catless up-pipe mods. What about a 2011 WRX with a Perrin catless up-pipe mod. Still don't need ECU tune?

  4. #93
    Registered User wreckingball man's Avatar
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    the pre-06's had a cat in the up-pipe. Pretty sure you don't, so therefore there's really no reason to replace your up-pipe.

  5. #94
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    Yes, pre 2006 for the WRX. 2004-2005 STi did not have UP cat.
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  6. #95
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    Quote Originally Posted by Lt Dan_87 View Post
    You mentioned pre-06 WRXs and catless up-pipe mods. What about a 2011 WRX with a Perrin catless up-pipe mod. Still don't need ECU tune?
    No, you do not need a tune for an uppipe on any year.
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  7. #96
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    What stage should I tune to with a turbo back exhaust? 93 octane is hard to find in oklahoma, but if I drive 15 minutes I can get it for $5 a gallon.

  8. #97
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    Quote Originally Posted by Lt Dan_87 View Post
    What stage should I tune to with a turbo back exhaust? 93 octane is hard to find in oklahoma, but if I drive 15 minutes I can get it for $5 a gallon.
    Damn that's crazy! If you go to Wal-Mart can you find an octane booster? That might save you a few bucks at the pump.

  9. #98
    zax
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    Quote Originally Posted by Lt Dan_87 View Post
    What stage should I tune to with a turbo back exhaust? 93 octane is hard to find in oklahoma, but if I drive 15 minutes I can get it for $5 a gallon.
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  10. #99
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    Quote Originally Posted by livid_wrx View Post
    Damn that's crazy! If you go to Wal-Mart can you find an octane booster? That might save you a few bucks at the pump.
    You'd need a lot of octane booster to boost 15 gallons of 91 octane fuel to 93 octane. You'd spend more money in boosters than to pay the difference at the pump.
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  11. #100
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    Quote Originally Posted by livid_wrx View Post
    Damn that's crazy! If you go to Wal-Mart can you find an octane booster? That might save you a few bucks at the pump.
    Regardless of what it says on the bottle, you aren't going to get any where near 93 octane from 91 with anything. Also, that stuff is going to make a mess of things, like your front O2 sensor.
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  12. #101
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    Quote Originally Posted by zax View Post
    You'd need a lot of octane booster to boost 15 gallons of 91 octane fuel to 93 octane. You'd spend more money in boosters than to pay the difference at the pump.
    Hey there you type too fast.
    "From a little spark may burst a mighty flame." - Dante
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  13. #102
    Registered User wreckingball man's Avatar
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    Zax is definitely a ninja poster.

  14. #103
    zax
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    Quote Originally Posted by mycologist View Post
    Hey there you type too fast.
    It's tough to read my monitor when it redshifts.
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  15. #104
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    Never used the stuff, just going on what other people say. But those were also Honda forums. I'm also blessed to be in Michigan where 93 sells for $3.80 a gallon haha.

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