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      07-29-2017, 02:31 PM   #1
Ronin135
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Need some advice on a catback system

Hi,

Been looking at a AA catback system for my 135i. My question is after the install do I need to get it tuned, or will I get the benefits as soon as I bolt it on. The site says I'll gain 11.5 hp and 11.5 in torque. But they don't mention tuning. My son just did a catback on his Evo X, his car he has to tune because his catback opens up to 3" at the catback.

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      07-30-2017, 06:38 AM   #2
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Ask a moderator to move this thread to the 135i section .. this is the 1M section.
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      07-31-2017, 11:35 AM   #3
Ronin135
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Sorry, I was using my phone it a little different

Last edited by Ronin135; 07-31-2017 at 11:36 AM.. Reason: Correction
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