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g,day there mate,
not sure of size there,but i do know"jegs" sells k&n pod/conical for throttle body for $42.99 for 600cfm and $49.99 for 1000 cfm/aftermarket t/b!
they are on page 200 g of there catologue in the tpi/lt1/ls1 part of book!
hope this helps you some what!
cheers
glen
australia
The filter on the front of the throttle body looks nice, but it is the worst place. It will draw hot air from around the motor. The stock setup is actually pretty good, and draws air from in front, where it is cooler.
I just used a 3" opening filter from the autoparts store (K&N) then ran a 4" to 3" rubber reducer (found in the PVC isle at lowes) to attach it all.... I have my TB-->Reducer-->MAF-->Filter. Filter fits perfectly on the MAF.