I am looking for a tip to fit my stock exhaust. I cannot seem to find anything that has a 3.5" inlet, only 4" which could be filled with a welder but that might be kinda ugly. I would also really like something a little smaller than 5". Does anyone make a 3.5 in 4.5 out tip or anything with 3.5 in? Any other suggestions?

Corsa makes a tip for stock exhaust

you might also check your local parts store..they usually have the smaller tips in stock.