Cat-back recommendation
Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
Originally Posted by redford
Save your money, just get a good muffler (Flowmaster?) and a good looking tip. The stock 05+ system flow OK.
...unless of course you want duals.
Elder User
Joined: Dec 2001
Posts: 578
Likes: 0
From: Massachusetts, USA
bb
I am not sure but somewhere between here and another site that the "high flow cat" was kind of a scam the extra cfm's were negligible if at all. The post was written by a guy who actually built catalytic converters. Not sure of the accuracy but thought it was worth a mention.
I was looking at those options for my old gasser but was advised against and told go with a cat back for my app. Obviously I was not at 500hp so my needs were different. My cat back and hypertech(not a big fan anymore) gave me a 2-4 mpg boost.
I am not sure but somewhere between here and another site that the "high flow cat" was kind of a scam the extra cfm's were negligible if at all. The post was written by a guy who actually built catalytic converters. Not sure of the accuracy but thought it was worth a mention.
I was looking at those options for my old gasser but was advised against and told go with a cat back for my app. Obviously I was not at 500hp so my needs were different. My cat back and hypertech(not a big fan anymore) gave me a 2-4 mpg boost.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Don't bother with replacing the cats on the 05'up SD gassers. The 05'up SD exhaust is far better than the 99'-04' SD exhausts which only used on massive cat. The 05'up SD gassers use two cats. The stock exhaust system is a heavy duty stainless system with decent bends. I would just replace the restrictive stock muffler with a free flowing aftermarket muffler and add a nice stainless exhaust tip. It will cost far less $$$ than a cat-back system.
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
Originally Posted by Green_Monster
bb
I am not sure but somewhere between here and another site that the "high flow cat" was kind of a scam the extra cfm's were negligible if at all. The post was written by a guy who actually built catalytic converters. Not sure of the accuracy but thought it was worth a mention.
I am not sure but somewhere between here and another site that the "high flow cat" was kind of a scam the extra cfm's were negligible if at all. The post was written by a guy who actually built catalytic converters. Not sure of the accuracy but thought it was worth a mention.
i guess if nothing else it allowed for some more sound while still being legal.
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Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
High flow cats do flow more CFM. They also let more sound through.
I ditched the massive stock converter on my new 04' before the truck had 10k on it. Helped remove some dead weight too.
The 05'up exhausts are much better.