On my trickflow elbow that i have bolted to my explorer upper, i looked inside and wow i was amazed at how much of a mismatch there is, i mean the elbow is actually larger by abut 5mm on all sides of the intake port, i dunno if this happens on better, or other intakes, but on my explorer it did. what i did was take and use a crayon to mark out the size diff, then i went to work with a dremel and then a sandpaper wheel. its now smoothly ramped in, and the whole entrance to the intake is shiney and smooth, there was actually a large amount of casting buildup on the bottom of the hole, about at least maby 8mm of rough jagged buildup from when it was made, that would have blocked some flow for sure, wish i got some before/after pics, but oh whell. This is just a fyi, maby you guys should check yours out if you havent, cause that i bet will pick up a good amount of power if it has smooth airflow lik ei have it now.