Cat back vs Turbo back Exhaust - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 07-07-2010, 09:55 AM Thread Starter
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Cat back vs Turbo back Exhaust

Right now I have a cat back 4" straight pipe on my truck. I was wondering if there is much difference in performance or noise between that and running 4" from the turbo back?

I'm trying to gain a little more turbo noise and if it'll reduce EGT's that's just a side benefit.
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post #2 of 15 Old 07-07-2010, 10:06 AM
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Quote:
Originally Posted by Vip View Post
Right now I have a cat back 4" straight pipe on my truck. I was wondering if there is much difference in performance or noise between that and running 4" from the turbo back?

I'm trying to gain a little more turbo noise and if it'll reduce EGT's that's just a side benefit.
Is the cat still on the truck or is it deleted?

Email: Dave@powerstroke.org
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post #3 of 15 Old 07-07-2010, 10:07 AM Thread Starter
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The Cat is still on the truck, starting after the cat it is a staight 4" run to the rear.

Early 1999 F-250 PSD SCLB
4" Turbo back - DIY 6637
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post #4 of 15 Old 07-07-2010, 10:09 AM
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Quote:
Originally Posted by Vip View Post
The Cat is still on the truck, starting after the cat it is a staight 4" run to the rear.
Order a cat delete pipe you will be fine.

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
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Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
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http://nolimitfabrication.com/
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post #5 of 15 Old 07-07-2010, 10:13 AM
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Turbo back will give you more turbo noise, and probably lower EGT's(more free flowing). As long as you not in a state that has emission testing. I run a 4" turbo back MBRP with a 5" tip and like it...Good Luck....Steve


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post #6 of 15 Old 07-07-2010, 10:18 AM
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So I am runnin a 4" magnaflow system from downpipe back with no kitty and a magnaflow muffler. Would I stand to gain anything by removing the muffler and going straight out?

06' F-250 CCSB FX4 6.0
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post #7 of 15 Old 07-07-2010, 10:25 AM Thread Starter
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Going to the muffler shop after work to see what it'll cost to have them piece a cat-delete in there in the interest of $$$. Truck is bone stock and I won't be putting a serious tune on it any time soon so not sure running new 4" all the way up to the turbo will gain me much for the cost. Thanks for all the input -

Early 1999 F-250 PSD SCLB
4" Turbo back - DIY 6637
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post #8 of 15 Old 07-07-2010, 10:30 AM
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Quote:
Originally Posted by tmanscrew View Post
So I am runnin a 4" magnaflow system from downpipe back with no kitty and a magnaflow muffler. Would I stand to gain anything by removing the muffler and going straight out?
You will gain some exhaust tone and turbo whistle. Thats about it

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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post #9 of 15 Old 07-07-2010, 10:50 AM
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Thanks, Dave. Didn't know if the muffler was causing enough restriction to justify removing or not. Kinda like the way it sounds now. Thanks again.

06' F-250 CCSB FX4 6.0
3.5 downpipe w/4" Magnaflow
Missing Kitty
Airaid CAI
2" Newton Level(front)
1" Shop-made rear blocks
Moto Metal 956 wheels
295-70/18 Toyo Open Country A/T2's
ARP Studded
EGR Deleted(XDP)
Coolant Filtration System(XDP)
New Ford Oil Cooler
Zoodad
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Tunes by Matt & Eric
Bilstein 5100's
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post #10 of 15 Old 07-15-2010, 10:06 AM Thread Starter
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Ended up removing the cat and replacing the down pipe with 4" so it's now a straight 4" from the turbo back. Love the sound!

Early 1999 F-250 PSD SCLB
4" Turbo back - DIY 6637
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