Notice any difference on anything? Do you document fuel mileage etc? Any Dyno runs before/after?
Throttle body spacers Some sites say small gains, some say loss of low end. Like many "cold air intakes" they make a difference in the sound but not others parts. Some low restriction and CAI do provide more power but only at full throttle and higher rpm. I had tried a K&N on my Corolla. Blackstone labs picked it up on my next used oil analysis as a lot more dirt (silica) and asked if I had a performance filter or to verify correct install or post filter leaks. I went back to stock, less dirt + better life for me. Never noticed any performance or MPG gains on that.
