Yes, Donaldson makes exhaust reducers. That said, a reduction from 4 to 3 inches is a big step backwards in the amount of cfm that can flow through the smaller pipe vs the larger pipe. Without knowing particulars it's impossible to say with 100% certainty, but in most cases a reduction like that will probably put too much backpressure on the exhaust system and cause at best a loss of power in the engine. If it's a turboed engine then it's for sure going to cause problems. Your best bet would be to spend the money to get the right size stack because not doing so could cost you alot more later on in problems with the engine like burnt valves, etc, etc.
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