Loud cold start solutions?

[BmacIL]

I just tried a cheap and highly effective solution suggested by another member: pool noodles.

For my 3" exhaust, I got a 3" solid pool noodle, cut 8" long pieces, and drilled some 1/2" through holes in it to let exhaust out. It's quieter than stock. For 2.5" exhausts, you can find noodles with a hole already in them.

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[Andy13186]

Go back to stock mufflers and get electric cutouts

 

[BmacIL]

Go back to stock mufflers and get electric cutouts

No.

 

[Cory S]

If you get headers, you're going to need a tune regardless.

You actually don’t. Between the ECU seeing any increased airflow rate through the MAF sensor, and closed loop fueling targeting a commanded lambda, there’s zero reason for a retune.....Fuel type (timing changes), injectors, boost (again timing changes usually), cams, etc are usually the only thing that would REQUIRE recalibration.

 

[Zelek]

You actually don’t. Between the ECU seeing any increased airflow rate through the MAF sensor, and closed loop fueling targeting a commanded lambda, there’s zero reason for a retune.....Fuel type (timing changes), injectors, boost (again timing changes usually), cams, etc are usually the only thing that would REQUIRE recalibration.

Go ahead and run that stock tune with long tubes and let me know how it works out for you.

 

[AZ18yote]

Vibrants help. I also find cold starts on ff / e are much more mellow than when on pump 91.

Bmac's solution is pretty ingenious. There was another user on here that created a DIY solution of like a coffee can size foam thing they slipped over. Both pretty simple but seek to address the issue.

 

[BmacIL]

I just tried a cheap and highly effective solution suggested by another member: pool noodles.

For my 3" exhaust, I got a 3" solid pool noodle, cut 8" long pieces, and drilled some 1/2" through holes in it to let exhaust out. It's quieter than stock. For 2.5" exhausts, you can find noodles with a hole already in them.

Here's a video.

 

[Jobodizo]

Here's a video.

That...is a fantastic idea. So simple.

 

[Poseidon RRT]

Here's a video.

have you had any issues with throwing codes?? Does this still provide enough flow where there will not be any back pressure problems.
I really may have to use this idea as I live around quite a few retired folks.

 

[Poseidon RRT]

If you get headers, you're going to need a tune regardless and the tuner can tune out the obnoxious cold start. I start my car in the garage and wait about 10 seconds before opening it because it doesn't take long to go down to a soft idle when backing out. Aside from the first loud noise when it starts, that's all it is.

how well does this work for you? I have a fairly insulated garage and could potentially do the same thing. not sure if a DIY baffle system is all that safe either.

 

[BmacIL]

have you had any issues with throwing codes?? Does this still provide enough flow where there will not be any back pressure problems.
I really may have to use this idea as I live around quite a few retired folks.

Not a single issue. There's enough exhaust flow coming from the holes I drilled to not cause excessive back pressure at all. You do need to get them in there tight as they'll pop out on initial start up and fly halfway down the driveway LOL. Once running the gasses are flowing through them fine.

 

[Zelek]

how well does this work for you? I have a fairly insulated garage and could potentially do the same thing. not sure if a DIY baffle system is all that safe either.

Well, no one has bitched in my HOA facebook page or to me directly when I leave at 6 am so it must be working.

 

[kiszl]

Here's a video.

This is so hilarious but brilliant haha. Kudos to you for coming up with this. I saw someone do a variant of this where they would have like a cluster of towels taped together and slide it over their exhaust for cold starts but this seems more efficient.

 

[jmeiers]

How do you keep them from blowing out? I have 4 exhaust tips and 1-2 of them blow right out the back every time I cold start. My pool noodles are cut to 15 inches each and shoved in there pretty good and tight with a twisting motion. It would certainly work good if all 4 stayed in. I can hear how much sound is deadened as I pull out the other noodles that stayed in.

 

[BmacIL]

How do you keep them from blowing out? I have 4 exhaust tips and 1-2 of them blow right out the back every time I cold start. My pool noodles are cut to 15 inches each and shoved in there pretty good and tight with a twisting motion.

Sometimes one does, sometimes not. The noodle is a bit oversized so it's tight. Maybe drill more holes to reduce restriction a little more. They reduce noise dramatically.

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