Horrific drone on a used MXP Comp RS... potentially damaged? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

crowbar_combat · 01-12-2023, 05:33 PM

Hello,

I recently bought a used MXP Comp RS catback, and the low-pitch drone was so bad from 2.5k-4k RPMs that it left me with a feeling of pressure in my ears after driving like it was giving me hearing damage and I had to take it off after a day.

I'm also running a catless JDL UEL header which I suspect makes it worse, but I'm wondering if the muffler or resonator was potentially damaged by the previous owner and it may be abnormally loud as a result.

Is this just how these exhausts are, or is this one likely not working properly? Is there a practical way for me to check the integrity of its internals?

Thank you

RedReplicant · 01-12-2023, 06:01 PM

To be expected with a catless uel and that exhaust

EAGLE5 · 01-12-2023, 06:06 PM

Don't double up, yo.

crowbar_combat · 01-12-2023, 06:37 PM

Quote:

Originally Posted by RedReplicant

To be expected with a catless uel and that exhaust

Got it. Live and learn I suppose.

crowbar_combat · 01-12-2023, 06:37 PM

Quote:

Originally Posted by EAGLE5

Don't double up, yo.

What do you mean?

EAGLE5 · 01-12-2023, 10:57 PM

Quote:

Originally Posted by crowbar_combat

What do you mean?

Unrestricted header and unrestricted exhaust from two separate brands? You're asking for trouble. Either buy a system that was tuned all together so it won't be horrible, or just run one or the other. A header with the stock muffler is nice.

NoHaveMSG · 01-12-2023, 11:19 PM

A resonated front pipe will help with drone but it will still be loud. Being used, the packing in the cans could be toast too.

RToyo86 · 01-13-2023, 10:07 AM

Comp RS is known to drone on its own. I'd probably just sell and find something else. CSG touring is about all I can recommend that shouldn't drone. Beyond that it's a roll of the dice. I tried a few quiet CB/AB and they droned at lower RPMs.

You'll go down the rabbit hole chasing a fix with the existing setup.

gkubed · 01-13-2023, 11:24 AM

I once pieced together a JDL UEL catless header, Nvidia catted front pipe, and an MXP Comp RS. It sounded nasty, but it did drone on the highway more than I liked. I ended up selling it four days later for a $120 loss (let's call it a rental) and later picked up a used MXP SP for $500. The SP is much more livable and I totally recommend it in combination with the JDL UEL header.

crowbar_combat · 01-13-2023, 04:43 PM

Appreciate the replies guys! I'm definitely just going to sell it and look for something a bit more mature, oh well. The SP sounds great.

zc06_kisstherain · 01-18-2023, 03:09 PM

Or get Q300

Sent from my SM-N986U using Tapatalk

01-12-2023, 05:33 PM	#1
crowbar_combat Member Join Date: Dec 2022 Drives: 2018 BRZ Premium Location: Houston, TX Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Horrific drone on a used MXP Comp RS... potentially damaged? Hello, I recently bought a used MXP Comp RS catback, and the low-pitch drone was so bad from 2.5k-4k RPMs that it left me with a feeling of pressure in my ears after driving like it was giving me hearing damage and I had to take it off after a day. I'm also running a catless JDL UEL header which I suspect makes it worse, but I'm wondering if the muffler or resonator was potentially damaged by the previous owner and it may be abnormally loud as a result. Is this just how these exhausts are, or is this one likely not working properly? Is there a practical way for me to check the integrity of its internals? Thank you

01-12-2023, 06:01 PM	#2
RedReplicant Senior Member Join Date: Aug 2015 Drives: None Location: Arizona Posts: 948 Thanks: 1,513 Thanked 1,295 Times in 544 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	To be expected with a catless uel and that exhaust __________________ 2015 Subaru BRZ - TT5 K24 Swap

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01-13-2023, 10:07 AM	#8
RToyo86 Senior Member Join Date: Mar 2018 Drives: 17 Asphalt 86 Location: Ottawa Posts: 2,285 Thanks: 1,825 Thanked 2,432 Times in 1,216 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Comp RS is known to drone on its own. I'd probably just sell and find something else. CSG touring is about all I can recommend that shouldn't drone. Beyond that it's a roll of the dice. I tried a few quiet CB/AB and they droned at lower RPMs. You'll go down the rabbit hole chasing a fix with the existing setup.

01-13-2023, 04:43 PM	#10
crowbar_combat Member Join Date: Dec 2022 Drives: 2018 BRZ Premium Location: Houston, TX Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Appreciate the replies guys! I'm definitely just going to sell it and look for something a bit more mature, oh well. The SP sounds great.

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