07-25-2013, 12:42 PM
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#1
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Resonator mod?
Whats the deal with removing the resonator on the T-4's? Any performance gain? What about fumes coming in cab? I know this has been tossed around. Any thoughts out there? Good idea, or bad idea?
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Bilstein 5100's on all four, Eibach/Toytec front coils, OME rear coils, RCI skid plates, 1.25/1.5 wheel spacers front/rear 275/70/17 BFG A/T KO2's, drop in K&N, Cobra CB, Powerslot Slotted Rotors, Hawk HPS pads and Mobile-1 Lubricants throughout. 
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07-25-2013, 12:48 PM
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#2
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I was shocked at the noise difference. I was running the Dynomax VT with resonator still in place and it was close to factory sound. Once I cut the resonator off, BOOM it opened it up and it sounds awesome now.
The resonator has absolutely nothing to do with fumes or smell. Toyotas are notorious for stinking like rotten eggs due to the type of converters they use and the number of converters they use. Nothing you can do about that. I hate being behind other Toyotas on the highway. Yuck.
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2004 Limited 4x4 - 4.7L - Dynomax VT muffler - Airbox mod - Bilstein 5100s front/Daystar spacers rear - Cooper Discoverer AT3 P265/70-17
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07-25-2013, 12:52 PM
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#3
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How loud was it? Im still running stock exhaust? I do not want it too loud? Is the sound clean, or does it sound like my very first truck as a kid when I cut the mufflers off and thought i had a race car that sounded like crap?
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Bilstein 5100's on all four, Eibach/Toytec front coils, OME rear coils, RCI skid plates, 1.25/1.5 wheel spacers front/rear 275/70/17 BFG A/T KO2's, drop in K&N, Cobra CB, Powerslot Slotted Rotors, Hawk HPS pads and Mobile-1 Lubricants throughout.
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07-25-2013, 01:08 PM
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#4
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I cut my resonator off and just put a tip there instead, keeping my stock muffler. I noticed almost zero change in sound. Perhaps just barely louder, or lower but not extreme by any means.
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07-25-2013, 01:45 PM
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#5
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Do it. Leave the stock muffler. While cruising it is very quiet with no annoying drone. When you step on the gas you get a nice little rumble that you can only get from a V8, I guess you have a V8! The idle is pretty sweet too.
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07-25-2013, 02:34 PM
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#6
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For me it was to re-route the exhaust to the side. I had an incident with melting a couple beach chairs while they were on my hitch carrier going down the interstate. I've never really had an issue with the rotten egg smell that many people have. No noticeable sound difference for mine.
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07-25-2013, 05:51 PM
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#7
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I had the muffler swapped out for a Magnaflow, dumped the reso and had the exhaust routed out behind the rear tire.
Obviously the muffler changed the sound, but the biggest change is no more smelly exhaust. If I get on it with the back window I can get a hint of the rotten eggs, but that's it.
As for performance, better throttle response, for sure.
But I also modded my airbox too.
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07-25-2013, 06:10 PM
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#8
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I'm running the no resonator with stock muffler as well, dumped behind the passenger tire. I didn't notice a difference in sound compared to stock, but I'm sure there was a small one. Fumes coming in through the back window were reduced as well. If there was a change in performance it wasn't noticeable.
Last edited by gaterose; 07-25-2013 at 06:14 PM.
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07-25-2013, 06:45 PM
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#9
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I just cut my resonator off after it dumps over the axle, meant to get a tip but never did get to it. The noise is not too much different, idle has a bit of a burble to it that often makes me think it has a slight misfire, sort of that loping idle you hear on old V8's. On hard acceleration you get a nice throaty V8 roar, but nothing super loud; but enough to make me smile at times.
Basically the resonator smooths out the exhaust note so its much more flat sounding and damnpens the noise a bit as well. I found removing mine got rid of the exhuast smell with the windows down, only really notice it on start-up and then goes away after a couple minutes of driving with the window down.
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07-25-2013, 07:47 PM
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#10
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To make room for my CBI rear bumper I cut off my resonator and rerouted the exhaust to the side behind the the rear tire. I have an otherwise stock exhaust with a V6 and noticed no additional sound. Additionally, there was no performance benefit--just the tip was less likely to get squashed going over obstacles.
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07-25-2013, 09:17 PM
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#11
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Only reason I cut mine off was to route the exhaust out the side. You could also make the argument that the stock exhaust running straight back is likely to hit obstacles when going vertical. Either way, cutting it off offers more tangible gains in clearance and routing options and to my ear does nothing to make the truck sound different.
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09-07-2018, 12:48 AM
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#13
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Quote:
Originally Posted by MrBond
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09-07-2018, 11:58 AM
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#14
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Responding to 5 year old posts further up, but if your exhaust smells like rotten eggs, it's because your catalytic converter(s) are bad. That's not a 'Toyota' thing, that's a 'broken part' thing.
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12-26-2018, 03:46 PM
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#15
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Quote:
Originally Posted by Troymclure
I cut my resonator off and just put a tip there instead, keeping my stock muffler. I noticed almost zero change in sound. Perhaps just barely louder, or lower but not extreme by any means.
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Do you have a video? Considering installing a side exhaust on my V8 but know I need to remove the resonator to do so.
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