I went and bought some 4" pvc and it will only go down about half way before running into everything so i stuck with the flexable metal tube. I installed my system today too and now my rear sags There is alike a 3/4" difference in wheel gaps between front and rear..

Adam

 

What about 3" pvc? I doubt an extra inch in diameter is going to matter. I doubt there is that much airflow especially considering they just covered up the hole on the 2k1s.

 

Ya i think 3" will fit down there just fine. I like my set up now though

Adam

 

Ya... I'm gonna go for some 3" pvc... the tube I have now is VERY rough... I want something smoother.

 

Let us know how it goes. I'm trying to decide if I will use PVC or the flexible metal duct. I'm going for the 3" diameter.