91 Exhaust System

NFLjunkeez

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Feb 16, 2013
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I had an exhaust pipe break about 2 feet in front of a muffler due to rust. When I looked under the car, that 2 foot pipe (coming out of the muffler) is dangling towards the engine just waiting to catch something causing it to do a "pole vault" action and can cause big damage, possibly to my gas tank as the muffler rips away and bounces around under the car.

As some of May know, I've been battling an overeating issue with my 91 5.0 for a long time. My current exhaust pipes are 2".

Now that I have to replace these pipes, should i increase the size to 2.5 or 3" pipes? Would that help get heat out of my engine? What would it do to my back pressure?

I want to upgrade for better performance while at the same time getting rid of the amount of heat that is staying in my engine.

It's not overheating anymore but it still runs hot. After upgrading to A Frame gauges, my temp gauge reads just above 250° and stays there.

Would increasing my pipes help lower the temp?
 
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Stock exhaust should be 2.25". The upgrade that most go to will be 2.5" exhaust and I agree that this is where you should be moving forward. There is also no reason why your car should be running that hot, the exhaust should have no bearing on that either way
 
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Stock exhaust should be 2.25". The upgrade that most go to will be 2.5" exhaust and I agree that this is where you should be moving forward. There is also no reason why your car should be running that hot, the exhaust should have no bearing on that either way

What is the purpose of the upgrade? Does a quarter of an inch make that much of a difference?
 
What is the purpose of the upgrade? Does a quarter of an inch make that much of a difference?
2.5" exhaust is more of the industry standard than anything else. Is it absolutely needed? No. In years past I have had a low 10 second fox body that made roughly 500hp and still used 2.25" mufflers. That being said, any of the aftermarket exhaust systems that you will see in today's market will be 2.5". My vote for a car like yours would be a cat back exhaust system from a company such a magnaflow, stainless steel construction and a life time warranty. If it was some more growl that you are after at the same time then you can upgrade the stock H pipe to either an aftermarket H or X pipe with high flow cats.
 
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