I've got a 2007 Subaru Forester school-bus, with a EJ253 N/A mated to a 4EAT A/T.
So I've done some mild Googling, and came across This Great Post.
Deep in there is this gem:
THROTTLE BODY SPACER While not a new concept in N/A performance enhancement, suppliers for this part for the EJ25 seem to be just one. Area1320 sells a EJ25 TB spacer and has dynos on their site showing around 4hp gain. However most users have reported a significant gain in fuel mileage. Somewhere in the neighborhood of 4 mpg. At $150 this could pay for itself quickly. One caveat is that supplies seem to be pretty limited as the shop makes these on a part time basis. It is not their primary business.
My goals are:
- Better Throttle Response
- Easier Breathing
- Freer Reving
- Low vs Top-End Gain
- Affordable, Simple, Smoke-wrench not necessary. (Lots of corrosion in my region)
With that list of goals, does anyone feel that a Throttle Body Spacer will provide anything towards the list, even if we're only talking about "Butt Dyno" effect here? Anything more than Placebo would be fine. Anyone out there with experience of modding on the N/A EJ platform?
Thank you for your time.