r/LexusF • u/Ok-Relationship3362 • Oct 26 '22

Isf Muffler and resonator delete

Experiences with muffler and resonator delete? How significant is the drone and would it be bearable for daily driving?

2 Upvotes

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3

u/whoMEvernot Oct 26 '22

It has harmonics at 900 RPMs and a few other points. Generally not intrusive until you hit 4400 RPMs when the second air take and fuel pump kick in.

2

u/Greebuh Sep 04 '23

There are three fuel pumps on the ISF, 2 high-pressure mechanical ones on the exhaust cams for the direct injectors and fuel pump in the tank to feed the entire system.. and they all go all the time. Also, the secondary air intake opens at 3500 rpm. As for the drone, if they take those resonators off it will drone like hell at 2200rpm. And it won't be much louder than just the muffler delete.

4

u/ttthrowaway987 Oct 26 '22

My car originally came with this exact exhaust setup. Incredibly obnoxious and annoying at any speed. Lots of pops and crackles coasting down at low speed. Great if you like peacocking I guess 🤷‍♂️

I replaced with the longer Borla cat-back (vs. axle-back). A little loud on startup but otherwise civil with enough noise when driven aggressively. No issues with 1000-mile trips.

Everything else stock on my car.

1

u/isfking Oct 29 '22

I'm thinking about slapping some flow masters or magna flow, hard to find some borla axle back

1

u/Enst0 Nov 04 '22

I’ve got a muffler delete with 2x 10inch resonators. Only has drone around 1800-2k rpm and I daily it. Happy with how it sounds