DIY: Sound Generator Delete for $4

[EndlessAzure]

If you want to avoid the trouble of removing the tube from the firewall, you can use a a 5/8" (16mm) ID Vacuum/Cooling Bypass Cap on the plastic sound generator "L" piece.



Admittedly, the fit is a little tight out of the box. The ID is probably a little less than 5/8" in actuality (probably closer to 15.4mm). I had one on there for a couple of years, but the stress was causing the rubber to crack. Additionally, it was a little bit of a fight to remove it.



Just replaced it recently with another (luckily two are in the pack of assorted sizes from O'Reilley's for ~$5 when I bought them years ago [Dorman 02253]) and used a Dremmel to enlarge the ID by a tiny bit (~0.02" or 0.5mm). Combined with some rubber grease, it went on nicely.


-----


Alternatively, you can try to put a plug there. I measured the opening of the plastic L to be approximately 11.3mm in diameter (or ~7/16"). I haven't verified or tried it myself, but it may give you a reference to start with if you prefer that method,.

[PerCompLLC]

Probably one of the easiest, cheapest, and BEST mods I have ever done. Wish I had done it years ago on my FRS. Just did it on my 2019 TRD SE.

[Paiser]

The sound in the cabin is SOOO much quieter and it’s much much less drony. Really recommended mod! Why? Save your ears!

[cmiovino]

Technically for street class autocross, I can't change the inlet to the Perrin tube or even simply remove and block off the sound tube. I did however add a stopper at the firewall in the passenger side footwell to keep the piped in sound at bay for now.

I envy you people not having to adhere to strict rulesets.

[JD001]

I had a CAI installed, left the plumbing for the noise thing in place but had the pipe bunged up.. I just like the plumbing in place as it detracts from the other gubbins in the engine bay..

[DJ_JAZZY_DJENT]

yours didnt throw a code after this?

[ZC6_STi]

Originally Posted by DJ_JAZZY_DJENT

yours didnt throw a code after this?

Doesn't throw a code if you do this simple mod.

[Luns]

I keep all my sound generator plumbing in place as CA smog checks can give you a hard time for any of it missing.

I figured instead of capping things off with random pieces, I would use something actually designed to stop noises passing into a tube: ear plugs!

I pulled one of the tubes from the L piece, rolled up three ear plugs together and stuffed them into said L piece, and then put the tube back over them. I also pulled the hose from the piece at the firewall and stuffed three more ear plugs there in the same manner. Probably overkill, but I had plenty of extra earplugs.

Much quieter! And I'll be most impressed if a smog inspector flags it.