I recently went SD and i am having a 4 inch intake fabricated. I want to run the Perrin filter but it is 4.5 ID. So im sure OD is slighty bigger, if i run a 4.5 reducer coupler to a 4 the OD being slightly bigger will not fit the 4.5 coupler. Anybody running this setup? Im trying to see what options i have to fit the Perrin filter.

 

yes, what your saying will work

 

Anyone actually running this setup so i can verify the coupler will fit. I don't wanna pay over $100 and the coupler doesn't fit.

 

im running a perrin without speed density, so i feel like it would work for you i feel

 

Yeah without SD the filter fits right over the MAF adapter plate. Not what im talking about but thanks for the response.

 

Im using it on an injen intake pipe

 

So you are using the smaller 3.125 perrin filter?