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Allright guys, I have been looking at buying a turbo back exhaust for my truck. I'm having a hard time deciding between a 4" or 5" exhaust. I'm not going stacks because I need my bed as a trunk with a topper. I'm planning on upgrading the fuel system and injectors soon (60 hp) and buying a Intake.
Manly as a tow rig I'm looking to keep the truck reliable and cool, I'd like to know how much cooler the EGT's will be with a 5" over a 4" system? I'm also buying a coolez mega mouth turbo elbow.
go with 5". my MBRP 5" is actually 4" untill it gets next to the trans, then bells to 5". bigger the better as i see it. less backpressure for the turbo means easier breathing.
X2. I have a 5" cat back straight piped and it has a mean growl. My friends and family say they can hear the truck coming and going form a good distance. I love it. Cant go wrong with a 5” or bigger exhaust. :thumbsup
07 5.9 Quad cab, Single wheel, Short bed, 4X4, Big Horn Edition, Smoked Cab Lights from Recon, Predator tuner, 5inch cat back from MBRP.woot: Getting 33 BFG's, and a new turbo set up sooner or later.
You will get a different sound out of a 5", but you aren't going to get any performance benefit - EGT's or HP - from a 5" over a 4" unless you go up into the 600HP range. If you are going to drive it as a tow vehicle, I would consider adding the flow thru muffler so you don't get the droning you sometimes get from a straight pipe..
- Mine: '09 GMC Sierra LTX ECSB 2WD - Deletes, 4" Exhaust, AEM CAI, DP LMM 2.6 Stg 1.5 Drag Turbo, BD Manifold, Diamond Eye Downpipe, All Season Diesel Performance EGR/Grid Heater delete, PPE Race Valve, Edge Insight, '08 Hummer Wheels, DSP5 - EFI Live tuning by Mark Broviak @ Danville Performance.
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