2 cans won't be enough
but I agree, unless you do it every oil change there is no point in wasting the cleaner. It took me 6 cans of B-12 to get everything (that I can see!!!) in shape, and trust me, what I found on my '98 MTX wasn't 1/2 as bad as what my '96 ATX used to accumulate.
if you dump the cleaner in (as in clean LIM w/o taking it off etc...) change the oil too.
FYI: the copper cup goes into IAC hose. aka TH Fix
