ok i just read the whole thread sober
I would still clean the plugs with a spark plug cleaner are they NGK Spark Plug: Plug No. BKR5EIX ? i was thinking about geting a set...
well I see it like this bro if its the original cat and its a 89 how many miles on it? , time 2 throw on a magniflow .
Now im not a big fan of throwing parts on and seeing what happends I would like 2 see you finger this out. That test here above mention i have never done but sounds like a plan 2 me.