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Re:CIS throttle bodies--the search begin
You wont have much luck in finding a larger throttle body
that "bolts up" direct in place of the old one!
There are larger ones out there, but you'll have to modify
allot to get it to fit.
The "gains" will be "small" if any, on a stock engine setup.
What most tuners do, is machine area of the two butterflies, and
install only a single butterfly!
Again this is allot of work, for very little gain!
My own throttle body is modified, so the larger secondary
opens sooner! That or they both open equally at the same
time! It makes quite a noticeable difference above certain