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Visualrinse 08-14-2012 08:50 AM

New to Subaru, new to this forum, questions on exhaust and intake on '09
Hi all,
Got a new to me '09 Subaru and considering some mods. Most are aesthetic, but on the topic of performance:

A couple questions...
  1. Will installing a K&N air intake require ECU reprogram?
  2. Will installing a new performance exhaust like a Borla require ECU reprogram?
  3. Will these mods void a warranty?

Visualrinse 08-14-2012 08:32 PM

Any input from of the experts here? I know my questions are pretty pedestrian, but I could use some input.

If the cat back says it's 7-10% boost, and the filter is 14.9 HP (

What does this do to a 2.5i?

170 + 14.9 + (170*.10)


Just curious on how the calcs work.

Code 08-14-2012 09:03 PM

Calculations are spot-on.

lee07 08-14-2012 09:07 PM

No on intake

Exhaust, More of noise maker than anything, You can put one if you want but if its an automatic? Don't

Warranty on the exhaust will depend on what you did to it

I say don't do any of it

t^Lewis7 08-14-2012 09:17 PM

Welcome Visual. Probably not much action to your questions because relates primarily to the forced intake Legacy. However, check out the naturally aspirated section in the technical forum. There are several threads on the first page that should help answer your questions.

Visualrinse 08-14-2012 09:37 PM

Thanks all for your input and guidance on the other topic areas here. Apologies for posting in the wrong spot.

t^Lewis7 08-14-2012 09:46 PM

No apologies needed. We all were newbies on here once.
Also, be on the lookout for local meets. This affords a great opportunity to get together with others with more experience to bounce ideas off.

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