You explained it fine MA70. I thought we'd already gone over this in another thread.
Cyto, a missing cat will not cause any problems... a clogged one will! At this age it's not uncommon at all for a cat to be clogged.
Just an FYI for the benefit of the group - When a cat gets clogged it is usually due to certain chemicals building up and glazing on the catalyst (it's not really something you can clean off). However, it is always worth checking to see if a blockage is actually due to loose debris collecting in front of the catalyst... this can be cleaned out by back flushing the cat with pressurized air (do not spray the catalyst directly with a high pressure blower though, the honeycomb is fragile).
Backpressure is garbage... BUT too large of an exhaust DOES have negative effects on N/A engines and *some* forced induction systems. I'm not going to go into it. The temperature bump exhaust gasses see while passing through a cat make up for what restriction is presented by a *decently flowing* cat. There is no reason not to run a cat other than just being a cheap SOB... if you're concerned about pressure get a high flow cat; it's less headache come emission time and less polution (if you're on of those wackos who doesn't believe humans can create enough polution to cause ecological problems try driving through any major city on a day with low barometric pressure.... F#$%ing idiots...).
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