I've read a lot of good things about this relatively simple mod and am seeing if anyone has personal reviews. Just have a few Qs as well:

-does it set off any kind of codes? (esp. ones pertaining to the MAF)

-simple install?

-should I go non-competition (68mm which fits stock throttle body) or go competition (74mm which requires a new throttle body)

Thanks in advance!

 

Simple install, have you looked in your engine recently ?

Many people highly question the manufacturers performance claims

 

HI,Do yourself a favor and do a search on this topic.
Many opinions and many reviews are out there.
Results have varied ...
I have tested both on the dyno with my car,,did posts about them.
I would say out of the two sizes ,IF you were to do it,that you would be alot better off doing the 74TB one..
Good Luck..

 

IMO, if you do a larger throttle body, you need to improve the air flow into it with a 75mm Y-Pipe, like the one pictured below, for it to be an effective upgrade. IMO, there is no sense going to a larger throttle body, after a smaller or OEM feed Y-pipe.

It makes the most sense to combine it with upgraded intercoolers with 2.5" end tanks, 2.5" silicon connection hoses, 2.5" Y-Pipe inlets and then a 75MM Y-Pipe exit to the larger TB and larger plenum.