Subject	Trying to quiet 3" test pipe drone....
Posted by	TTkeeper on September 05, 2018 at 11:55 PM
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Message	Currently have 3" to 2.5" non-resonated test pipes and a Labree Exhaust...have the dreaded drone between 2000 and 2500 rpms. Have read that resonators don't really take care of the drone...so looking at welding in some high-flow cats in the test pipe stream. Question: How close to the downpipe end should the cats be located to be effective in reducing the drone ? Is there room under the TT for cats with an overall 4" diameter ( 3" in/out, but 4" diameter overall).
Follow Ups	Trying to quiet 3" test pipe drone.... - TTkeeper 23:55:18 09/05/18 Stock cat location is where they fit. (n/m) - Bernie (NoVA) 00:17:13 09/06/18 I went with 3" resonated TP's and it's overall pretty good. - PiotrC70 11:21:03 09/08/18 You might consider a resonated X-pipe - Polish 01:27:44 09/06/18 Re: You might consider a resonated X-pipe - Unluky (MO) 14:09:23 09/06/18 Did you get resonated TPs in addition to the resonated X - Polish 14:38:03 09/06/18 I have a full 3" exhaust. Even with large resonators - MixManMash 07:31:18 09/06/18 Did you calculate the necessary size of the helmholtz - nissubaru 14:26:14 09/06/18 I winged it. These are really Branch-T resonators. (n/m) - MixManMash 21:54:27 09/06/18 Synapse's testing shows biggest is best. - BlackholeZ 01:14:37 09/07/18 build a valvetronic setup like mine if you want it very - volcomstone550 14:00:19 09/06/18 Re: Trying to quiet 3" test pipe drone.... - Unluky (MO) 14:05:48 09/06/18 Cats are supposed to be better than resonators - ZXoltan 16:04:10 09/06/18 That has been my experience also; however, the nature of - Gordo NA2LS Daytona 09:27:13 09/08/18 I had very similar exhaust for years..... - Z ONLY1 17:23:11 09/06/18 Re: Trying to quiet 3" test pipe drone.... - holcomb74 19:52:12 09/06/18 Has anyone recently tried a venturi inside the exhaust? - MikeD (Philly) 11:46:23 09/07/18 Yeah this is the easy mod I'd suggest. (n/m) - BlackholeZ 02:42:06 09/08/18 I had a venturi in my setup on a car I owned in the past - Mr.Stacy 06:02:35 09/08/18 Did it quiet down the B&B or just help with resonance? (n/m) - ZXoltan 15:03:37 09/08/18 Changed the tone and helped with the resonance. I - Mr.Stacy 04:58:06 09/09/18 Yes, I used one. I was advised to install it as close to >> - Gordo NA2LS Daytona 09:18:21 09/08/18 I’ve been looking at these and my thoughts were - MikeD (Philly) 14:16:39 09/09/18 Borla has always been 2.25 for the z32 (n/m) - Bernie (NoVA) 23:27:07 09/11/18
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