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#3" downpipe require engine management?

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 Post subject: 3" downpipe require engine management?
PostPosted: Fri Mar 27, 2015 2:42 pm 
First Gear
Joined: Sat Apr 22, 2006 2:41 am
Posts: 60
Location: portland, OR
Currently running 3" from the mid pipe back and wondering if I go with a 3" downpipe will I need engine management? I was also going to install a new header because I think my current one is bad.

Running a td04, top mount intercooler and cone intake.

Thank you for any information and opinions on this.

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1991 Legacy turbo


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 Post subject: Re: 3" downpipe require engine management?
PostPosted: Fri Mar 27, 2015 3:26 pm 
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Joined: Tue Aug 25, 2009 7:52 am
Posts: 4820
Location: Des Moines, Wa
In my opinion and experience, the 3" pipes counterintuitively made my td04 spool up slower. And since I wasn't running the turbo over 12psi, the freer flowing exhaust's benefits were wasted. With a td05 and robtune, the stock exhaust choked, and the larger exhaust made it come alive.

So, imo, 3" pipes don't need engine management and made my car slower. On a larger turbo, Def upgrade the pipes and engine management.

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1992 Legacy SS 5mt, build in progress


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 Post subject: Re: 3" downpipe require engine management?
PostPosted: Fri Mar 27, 2015 6:33 pm 
First Gear
Joined: Sat Apr 22, 2006 2:41 am
Posts: 60
Location: portland, OR
Thank you. Sounds like I am good where I am at, haha.

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1991 Legacy turbo


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 Post subject: Re: 3" downpipe require engine management?
PostPosted: Sat Mar 28, 2015 4:20 am 
Third Gear
Joined: Sun Jul 15, 2012 11:50 pm
Posts: 859
Location: sw colorado
i run a full 3" tbe and my car seems more alive. my set up is a jdm td04 06 xt tmic fcd and running 14 psi


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