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  #1  
Unread 12th July 2019, 06:22 AM
Austas75 Austas75 is offline
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Default SF Forester larger diameter exhaust

Not sure if this is in the right section?

But I am looking at replacing my exhaust and was toying with putting one on with a larger diameter has anyone done this and was there any performance gains?
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Unread 12th July 2019, 07:20 PM
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I have a modified exhaust system; can't remember the diameter but it's a little larger. You don't want it to be too big as the engine relies on back pressure. I have aftermarket free flowing cat and resonator and I think they would make more difference than any increase in the pipework. Performance gain - possibly but hard to gauge unless it was dynoed before and after.
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Unread 13th July 2019, 07:13 AM
Austas75 Austas75 is offline
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Ok Thanks, Kevin, I just want a little extra power to help with towing. I will look into a free flow cat and resonator.
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Unread 13th July 2019, 02:55 PM
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If your SF is non-turbo, it won't help.

But you can go into low range even on road, that helps alot as you have a 1,447:1 ratio.

Another option is to fit an EJ22 if you have an EJ20/122hp engine or an EJ25 if you have an EJ20/125hp engine because of harness compatibility.
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Unread 13th July 2019, 09:00 PM
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@Austas75 BTW - I only replaced the exhaust system because it needed replacing. If your exhaust is in good condition then I wouldn't bother.
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