Turbo Back or Cat Back

[DWakefield]

Recently purchased 07 5. 9 with 14k and am not very educated on the 600's! Can someone help me decide on which exhuast will work better a cat back or turbo back, 4" or 5" Truck is completely stock and am looking to start building. Thanks!!!

 

[SShafranko]

Stock is 4 inch. If you are going to exceed 500 rear wheel horses and install an after market turbo in the future go with 5. Otherwise don't waste your money. Also its a bit louder with 5 inch.

 

[jgillott]

For what it's worth, I installed mine CAT back.

 

[MAllen1]

You can install a catback, but, the 5. 9 doesn't have the DPF. That being said, i'd go turbo back to try to control EGT's a little better.

 

[lmills]

either go 5", or install a free flowing muffler. Like the others have said, the factory installs 4" on the 600 series and newer motors. The biggest restriction on the factory system is the muffler.

 

[Joseph Donnelly]

The biggest restriction in the stock exhaust system is the turbocharger. Expect very minimal gains from increasing flow capacity after the stock turbo. I would consider a larger turbo first. Don't go overboard to a huge turbo with a near-stock Turbo Diesel, as some of that “restriction” in the turbine housing and sizing of the turbine wheel is necessary and desirable.

 

[CurtLee]

I put a dual 4" cat back on my 04. 5 and like Joe said the restriction is in the turbo. I didn't see much difference in EGT's w/o a muffler. But it sounds cool and looks way better than factory.

 

[MGroft]

Do you need the cat left on their to meet smog? I have a 03 no cat on mine from factory. I put on a 4in TURBO back exhaust. Think since you have an 07 that you have that exhaust reburner thing on your truck don't you?It takes the exhaust gases & tries to burn it again to meet emissions. If so what will happens if you take the cat off?WILL YOU PASS SMOG?????





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[Metroneck]

07 5.9

FWIW- I have an 07 5. 9L that I use as a "road truck" for my job in medical sales. Right after buying my truck I cut out the cat and installed a 5" turbo back MBRP with a minimal resistance muffler. The pro's: EGT's are lower when pulling (have a 5th wheel), better response, and 1-2 mpg in fuel mileage. The con's- it growls when you are running 75 mph/2100 rpms so be prepared to have minimal conversation!



Overall cost in 07 before the prices of everything skyrocketed- was about $350 for the "aluminized" mandrel bent and about $100 for the MBRP 6" tip.

 

[JDiepstra]

Save yourself time, money, trouble... . cut out the stock muffler and put in an aftermarket one.

 

[Ducman82]

I did a 5 inch Turbo back, way lower EGT's and a much better sound!