well i got tired of looking at the stock intake manifold,an eye sore,so i decided to buy a d-plenum from rmr,didnt really look at the specs on the size of it.i was really expecting a 3in tube,but when i got it the thing is a massive 5in o.d and 4.5 i.d .i sent it a few days ago to a welder that works with my cousin,really good welder,especially that im using the stock runners..so hopefully ill be getting it back next week and install it with the q45 tb i just bought..