Had a cell w/ foam in the Camaro (5 sec 1/8 mile, SBC N/A, drag only), but it started breaking down after a couple years. Removed it at that time and been that way ever since w/ no trouble.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax