4" Turbo Back Cat? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 3 Old 02-14-2012, 07:45 PM Thread Starter
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4" Turbo Back Cat?

So I plan on doing a few mods to the truck in the spring. So far I have tried to be pro-active and changed to ELC Cat coolant, Installed a coolant filter, Scan-gauge, and did the blue spring update. My Delta is about 9-11 at the highest with the stock egr cooler. I live in Mass and have inspections every year. Will I lose a ton of performance having a MBRP 4"turbo back with a cat? Or should I do a SCT programmer with a light tune / egt probe? Also I still have a Ford ESP so should I not touch anything till that's done around 100k? Thanks

06 F350 6.0 73k
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post #2 of 3 Old 02-15-2012, 08:45 AM
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I purchased a 4" Diamond Eye kit without the cat or muffler (straight pipe) and welded the cat back into the system after opening up the inlet and outlet of the cat to the new 4" diameter. Works well and only took a few minutes extra to stay legal without going all the way back down to the stock sized piping. I did run with it straight piped first and noticed a few degree rise in EGT after reinstalling the cat, but not enough to make me worry yet.

One thing I am considering doing is making a drop out section with two of the 4" band clamps to allow me to easily swap between kitty and no kitty... I have an extra section of 4" exhaust pipe to try it with, so I might as well...


03 Excursion XLT 6.0 4x4 "Short Bus" - Gone
03 F350 CCLB Lariat 4x4 with some stuff - Gone
06 F250 CCLB Lariat 4x4 tuned, deleted - Gone
05 Excursion Lariat 4x4 murdered out, studded, deleted, and tuned.
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post #3 of 3 Old 02-15-2012, 04:03 PM
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Read your ESP closely, it says 5 years OR 100,000 miles, being as this is 2012, you've covered the 5 yr mark.

Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch

WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!

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