Originally Posted by VolantGC8
I do. Am I happy I have them?...sure any mods I can buy for my N/A suby are fine by me.
Does it work: I would say yes as a pair there is a little more top end breathing due to the much larger plenum. Also, I have a scan gauge to monitor intake temps and the manifold spacer helped enormously.
I have them as well (see above). I'm pretty sure the IAT (intake air temperature) is taken at the MAF which is before both the TBS and IM spacer. Thus the thermal benefits of IM spacer are an after effect of the IAT. (IAT is will remain unchanged with/without IM spacer for given ambient temp) Credit to Grimmspeed who pointed this out, unsure if this is for all Subaru's, stands for 05+.