How To Make IS350 Quieter

Reply Subscribe

Thread Tools

Search this Thread

Nov 19, 2019 | 01:26 PM

Brosillo

Thread Starter

Rookie

iTrader: (1)

Joined: Jun 2014

Posts: 78

Likes: 2

From: Missouri

How To Make IS350 Quieter

I know this may sound odd, but I am trying to figure out the easiest/cheapest way to make my IS350 quieter. My gf has been driving this car as I have upgraded vehicles and she hates how loud it is. I originally had the Tsudo axle back and AR-25 resonator. I loved the sound but she wasn't really a fan. I swapped out the AR-25 resonator for the longest glasspack muffler available at my local exhaust shop since that is what they recommended to bring the sound level down. Well they were right and it was SOOOO much quieter after this and she was happy. Over the past 6 months since swapping out the resonators, it seems like it is just as loud again. She actually likes the look of the larger exhaust tips, as do I, because it does make the rear of the car look "cooler", so we don't want to change the Tsudo axle back part. The car actually wasn't even that loud with just the Tsudo until you revved it out. So what can I do to quiet up this setup that would be the easiest/cheapest? I don't want another solution that only lasts a few months and then needs to be fixed again, but I also haven't been able to find a new 2008 Lexus IS350 OEM resonator online. Any help is appreciated.

Nov 19, 2019 | 03:19 PM

Zmon

Racer

iTrader: (2)

Joined: Dec 2014

Posts: 1,534

Likes: 224

From: Illinois

Easiest way? Go back to stock, and that includes going back to the stock axleback. Unfortunately, if you cut off the midpipe, you'll have to see if a shop can weld in an OE aftermarket equivalent, or find one. With the amount of members here that remove theirs, I wouldn't be surprised to see one offer to sell one to you if you post in the classifieds section.

Nov 19, 2019 | 08:42 PM

davidbusta

Intermediate

iTrader: (1)

Joined: May 2019

Posts: 378

Likes: 92

From: California

Im planning on getting an axleback for my car within the upcoming weeks and possibly a resonator delete. if you are still interested in a stock setup by then i wouldn’t mind selling it to you. 06 is350 but i think it should fit.

Nov 20, 2019 | 10:03 AM

2013FSport

Lexus Test Driver

iTrader: (2)

Joined: Aug 2017

Posts: 6,720

Likes: 1,572

From: OR

Rather than a cheap glasspack get one filled with SS mesh. It should last for 4 years or so. Then again if its all short drives never reaching full temp to get the moisture out its life be shorter...

Dec 9, 2019 | 06:46 PM

DickH

Intermediate

Joined: May 2015

Posts: 448

Likes: 71

If you are just trying to quieten the car for someone inside try gutting the trunk and adding sound deadening material. I did this to mine and it reduced the noise inside the car quite a bit.

Dec 9, 2019 | 08:26 PM

kitabel

Lexus Champion

Joined: May 2016

Posts: 3,619

Likes: 94

From: New York

Restricting the tailpipe outlet has a strong effect. If your current pipe is 2" ID, adding a cap with a 1-3/4" hole (no taper, radius, blah - just a hole) instantly makes the car quieter at all speeds.
No, it's not pretty.

Jan 21, 2020 | 09:04 AM

Brosillo

Thread Starter

Rookie

iTrader: (1)

Joined: Jun 2014

Posts: 78

Likes: 2

From: Missouri

Still looking for a solution to this. Stock used exhaust parts are ridiculously expensive (some are more expensive than upgraded midpipes...). Is there any specific resonator or muffler I could put on my car that will guarantee a quiet exhaust. See attached for an example of how my exhaust sounded before the resonator and after. If I could get back to the "before" sound level for my girlfriend, that would be awesome.

Feb 20, 2020 | 11:48 AM

davidbusta

Intermediate

iTrader: (1)

Joined: May 2019

Posts: 378

Likes: 92

From: California

I dont think mileage really matters too much on exhaust parts as long as they are not rusted, have cracks, or leaks on it.

May 29, 2020 | 08:36 AM

#10

Brosillo

Thread Starter

Rookie

iTrader: (1)

Joined: Jun 2014

Posts: 78

Likes: 2

From: Missouri

Bump for question:

I finally purchased a stock but used resonator (Toyota part #53102) and took my car to a muffler shop. I explained the situation about how the muffler/resonator I currently have on the car seemed to make the car extremely droney and loud, and I just want to get it back to stock. The muffler shop refused to just replace the current installed muffler with the stock part I purchased. The place has really good reviews, and the guy I talked to was very nice, but he said he didn't want to take my money for something he thinks isn't going to help at all. The advice I got from this forum is getting it back to the stock resonator is the correct strategy to get it quieter. You can see the above youtube video how much a difference there was even with the aftermarket axle back exhaust. So now I don't know what to do. Was this guy wrong and I should just find somewhere else to install the stock resonator?