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Old Jul 29, 2025 | 09:50 AM
  #1  
Jeremy Mathews's Avatar
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Dumb Exhaust Question

I am looking to finally straight pipe my OBS and get rid of the cat and muffler. I did the 3 in. downpipe upgrade and bellowed up pipes and all that a while ago. Soooo the hard part is done.
I am hoping to spend as little as possible and was wondering if I get a cat back system instead of the turbo back will I have enough pipe to delete everything?

This was the one I was looking at and wanted to see if anyone has done this before?
Diamond Eye 4" Aluminized Cat Back Exhaust W/ Muffler Delete
 
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Old Jul 29, 2025 | 10:16 AM
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Hit Man X's Avatar
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Unless you are pushing good power, wasted money to swap the stock stuff. It is what 3.5"? These trucks maybe roll out 180rwhp bone stock and 230rw area on stock sticks tuned uncorked.

The downpipe is known junk weak point.
 
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Old Jul 29, 2025 | 10:19 AM
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Yeah the downpipe is the only thing for performance. hence why I did it years ago. Now its just for my ears Haha.
Do you think it would also be just as fine to find some 3.5 in pipe and just cut out the cat and muffler? That sounds even cheaper
 
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Old Jul 29, 2025 | 10:29 AM
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I believe it would be, especially if you can fab a bit.

No clue what the D.E. 4" runs now. Mine is their SS kit, front to back with muff. Got a free tip. It was about $300 shipped them back then.
 
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Old Jul 29, 2025 | 10:32 AM
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Oh yeah they were like 450 now. I dont want to drop that much right now. I checked and based on reviews it seems the 4 in delete pipe that MBRP doesnt fit the stock 3.5.
So I guess my best bet is something like this Summit Racing SUM-640254 Summit Racing™ Exhaust Tubing | Summit Racing
Then I weld or clamp it in? not really sure yet.
 
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Old Jul 29, 2025 | 10:43 AM
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I would weld it in.

Absolutely no reason to drop that coin if on stock injectors. I know the stock 3.5 will support near 400rw, but average torque will increase with the 4" after a certain point
 
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Old Jul 29, 2025 | 11:02 AM
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I am not running stock at all. I am pretty modified, but not like overpower. I am running 205/30 hybrids with efuel and adrenaline HPOP. The HPOP was probably overkill but after 300K just felt like doing the whole thing
 
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Old Jul 29, 2025 | 11:12 AM
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You needed it do not kid yourself with the HPOP.

I have same basic mods you do...same sticks, HPOP, efuel, um, springs/pushrods, etc.

Depending upon how much power your tunes are set at, may want to do the 4" now and leave stock alone.
 
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Old Jul 29, 2025 | 11:27 AM
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Okay thats good to know. Right now I run gearheads and typically leave it at the street everyday tune sometimes jumping to the tow tune when I tow. I am not really one to go to hot tunes much. Although I am considering changing over to try JB tunes or something. Gearheads is sometimes kind of meh...
I might look into the 4 in set then and just replace it all from the downpipe back. I just want to make sure i get enough extra pipe to remove the muffler and the cat.
 
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Old Jul 29, 2025 | 11:34 AM
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keep the muffler, its straight thru with a chamber in middle to handle drone.
 
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Old Jul 29, 2025 | 11:37 AM
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What about CAT? is there any draw to keeping it vs removing? I assume its just a soot collector essentially?
 
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Old Jul 29, 2025 | 12:53 PM
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Do you plan on routing the exhaust over the rear axle? I cut my exhaust out near the back of my crew cab eliminating my muffler. I thought about kicking it out in front of my rear tire. But this morning I was thinking of just putting a shiny big tip pointing down right behind the the cab where the exhaust already routes. My exhaust is much more stinky after my performance upgrades and shooting the particulates to the ground may help instead of shooting it out to the side of the bed where everyone breathes. 🤷‍♂️

Y'all noticed after putting upgraded injectors in, your exhaust getting stinkier?
 
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Old Jul 29, 2025 | 12:57 PM
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I guess I was planning on just having it route where it does now. I dont really care where it exits I guess as long as its at least behind the cab.
As for "stinkier", I don't think I noticed much tbh. Also it was years ago so I dont honestly remember too much.
 
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Old Jul 29, 2025 | 01:04 PM
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Keep the stock exhaust minus the kitty, stock flows plenty even the muffler flows good, unless you like loud'ish exhaust.
 
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