TO: 7.3 Excursion owners with 4" exhaust
#16
03-20-2012 | 05:53 PM
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Joined: Dec 2010
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From: SC
MBRP 4" w/muffler here. I miss how quiet it was w/stock exhaust... 
It's not the deafening drone my '99 454cid Suburban had with basically straight pipes, but its not stock-quiet either. Overall, the stock exhaust with muffler delete on my F350 is quieter - inside and outside the truck. I actually prefer the tone of the straight-piped 3.5" exhaust! 
With 100% stock exhaust and the tunes I was running on the X, I had NO PROBLEM with EGT's even towing my 12k lb Toy Hauler in the heat of summer thru the Smokey Mountains. The ONLY reason I went to the 4" system is I have bigger plans for the X and stock won't be an option. There is no MPG or SOTP's power increase, so as long as you have good tuning - I cannot see WHY you'd give up a nice, quiet luxury ride for a noisy 4" exhaust.
(I think thats what old people would say... 
)
All that said, when that 4" MBRP sees 30psi of boost and 2500rpm's - it makes beautiful music!! And I am certain it took 1000's of miles of driving with no radio listening to that song before my fuel economy and tire wear got back to normal - but since I drive ALOT and tow about 50% of that, I miss the quiet interior the stock system provided. I have added dynomat stuff to the floor and will be doing doors and roof, but do not expect it to be stock-quiet ever again...
It's not the deafening drone my '99 454cid Suburban had with basically straight pipes, but its not stock-quiet either. Overall, the stock exhaust with muffler delete on my F350 is quieter - inside and outside the truck. I actually prefer the tone of the straight-piped 3.5" exhaust! With 100% stock exhaust and the tunes I was running on the X, I had NO PROBLEM with EGT's even towing my 12k lb Toy Hauler in the heat of summer thru the Smokey Mountains. The ONLY reason I went to the 4" system is I have bigger plans for the X and stock won't be an option. There is no MPG or SOTP's power increase, so as long as you have good tuning - I cannot see WHY you'd give up a nice, quiet luxury ride for a noisy 4" exhaust.
(I think thats what old people would say... )All that said, when that 4" MBRP sees 30psi of boost and 2500rpm's - it makes beautiful music!! And I am certain it took 1000's of miles of driving with no radio listening to that song before my fuel economy and tire wear got back to normal - but since I drive ALOT and tow about 50% of that, I miss the quiet interior the stock system provided. I have added dynomat stuff to the floor and will be doing doors and roof, but do not expect it to be stock-quiet ever again...
I drive a lot (25k+/year) and tow a good bit too. I dont plan on increasing horsepower much, just modding for reliability, longevity, mileage etc... Now Im thinking I should just stay with what I have, or maybe delete the aeroturbine muffler and see how that goes.
#19
03-20-2012 | 10:49 PM
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Joined: Jul 2008
Posts: 12,777
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From: N.GA Mountains
If you have fixed your drive pressure and boost leaks and still have to watch your pyrometer when towing - you need better tunes!
I can honestly say I don't NEED gauges with these tunes, even towing heavy. I ran different tunes for a looooong time and would have never believed this was possible. My 'burb had no cats and dual 2.5" pipes and a straight thru 2 in/2 out muffler when I bought it. It was Nascar loud at WOT, but the drone at 40mph was literally unbearable. I LOVED it - for about 1 day... We also replaced the NV 242? (auto 4wd option) twice - along with lots and lots of other things. I can honestly say I do not miss that turd - the Excursion is sooooooo much better!!!!
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