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Junior Member
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Discussion Starter #1
Is there any advantage to replaceing the cat converter with pipe? Im sure its not legal. But would it help or hurt my 5.9?
 

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Let it all Ride
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1,316 Posts
Not a huge power gain, but going to a 5" TBE, no CAT but still a muffler, I got 16 RWHP and 31 LBFT of TQ. But you will certainly see a mileage increase like southern said.
 

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Junior Member
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31 Posts
Discussion Starter #4
But not having the back pressure that the cat holds on the engine wont hurt me any? Its got 4" on it already.
 

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Junior Member
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Discussion Starter #5
I was thinking of taking cat converter off. Beating the insides out. And welding a peice of 2'' or 3'' inside it. The whole length. That way it would create a little back pressure on the engine. Good idea or not?
 

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Let it all Ride
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It's an alright idea but you're really not gaining anything by having too much back pressure on these engines. Plus you wanna keep your EGT's down.
 

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Junior Member
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Discussion Starter #7
So just knocking the insides out would be the best then? Just wasnt sure if the non back pressure would b an issue.
 

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TDG Mafia - Booze Runner
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3,705 Posts
So just knocking the insides out would be the best then? Just wasnt sure if the non back pressure would b an issue.
Not at all, go for it these things need to breathe.. Your main cause of backpressure actuly happens at the turbo not the cat but the cat is still a restriction down the line. Knock it out and get a good high flow Muffler..
 
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