I have a very low mileage '85 Caddy Seville. It is time for a new muffler and I am wondering about removing the catalytic converter. Will this make any difference? The car is severely underpowered and even 5 hp would be noticeable. Is there any other antique smog equipment I can remove? My state does not check cars this age. this is the 4.1, not the 8-6-4.