Exhaust too loud

Spartan 1771 · 12-30-2021, 05:03 PM

and as far as FI vs stock CBE is concerned, I don't think their design is very similar at all. The stock system is a Y-pipe, has a lot more bends and weighs considerably more.

Rusty · 12-30-2021, 05:10 PM

I have the FI lth's with the 12" resonators. There is some drone around 2500 rpm. The 18" resonators take most of it alway. The FI CBE is a true dual exhaust.

redondoaveb · 12-30-2021, 08:07 PM

Quote:

Originally Posted by Rusty

I have the FI lth's with the 12" resonators. There is some drone around 2500 rpm. The 18" resonators take most of it alway. The FI CBE is a true dual exhaust.

That's where my FI got drone was at 2500 rpm

redondoaveb · 12-30-2021, 08:11 PM

Quote:

Originally Posted by spoolin03

Do you have links?

KC at Tig Welding Creations

redondoaveb · 12-30-2021, 08:32 PM

Quote:

Originally Posted by backman_66

You can't have your cake and eat it.

1. You are supercharged. Should have went turbo if you wanted less sound.

2. You want max power so gutted your cats. There isn't really any good combination of exhausts that is going to reduce your noise levels enough to satisfy you. You're going to have to understand you'll have to eat some power in order to quieten things down through resonators and especially good mufflers.

1. True

2. You can't run cats in the factory location on a boosted car and expect them to last so he needed to get rid of the cats anyway. Even superchargers will destroy them in the factory location. I ran 100 cell mil spec cats in my lead pipes. My HKS Hi Power exhaust with Art pipes was super quiet and didn't rob the car of power. When it was on the dyno, we ran it uncorked because I thought I was getting an exhaust restriction. It only gained 10whp uncorked

DrBacon · 12-30-2021, 08:33 PM

Quote:

Originally Posted by spoolin03

The Motordyne y-pipe is restrictive since the dual 2.5" pipes are forced to converge into 3" space twice

It's a single merge and is more than enough for any N/A or mild boost application. Keep in mind oem header design have an output of 2.25"

But I do agree, F.I. is probably the best flowing exhaust on the market.

370z_stillen · 01-01-2022, 10:46 AM

Quote:

Originally Posted by backman_66

You can't have your cake and eat it.

1. You are supercharged. Should have went turbo if you wanted less sound.

2. You want max power so gutted your cats. There isn't really any good combination of exhausts that is going to reduce your noise levels enough to satisfy you. You're going to have to understand you'll have to eat some power in order to quieten things down through resonators and especially good mufflers.

Its not that I expect/want to become a Tesla, but looking for options to reduce noise without MAJOR loss of performance. I understand that adding resonators etc will decrease HP. Just looking for the best way to do it…

Rjk370z · 01-01-2022, 11:00 AM

I had a similar issue when I got my car. It had a resonated catless downpipe. Man, it was loud and I could not take it. Put the stock cats back on, much more manageable. Can you try putting the stock cats back on and giving it a try?

370z_stillen · 01-01-2022, 11:42 AM

Quote:

Originally Posted by Rjk370z

I had a similar issue when I got my car. It had a resonated catless downpipe. Man, it was loud and I could not take it. Put the stock cats back on, much more manageable. Can you try putting the stock cats back on and giving it a try?

Will try to add resonators first, if not, plan b and will look for cats

FrankEtier · 01-01-2022, 04:26 PM

I have the Greddy Evolution GT dual exhaust with motordyne Art pipes. Sounds great but is fairly loud and does drone at 3K rpm in my car.

spoolin03 · 01-02-2022, 01:32 PM

Quote:

Originally Posted by redondoaveb

KC at Tig Welding Creations

Looks like their next batch isn't until March

spoolin03 · 01-02-2022, 01:33 PM

Quote:

Originally Posted by FrankEtier

I have the Greddy Evolution GT dual exhaust with motordyne Art pipes. Sounds great but is fairly loud and does drone at 3K rpm in my car.

thank you for that. That one becomes 3 in duals at the end which is why they're louder im guessing.

spoolin03 · 01-02-2022, 01:34 PM

It drones even with the supercharger?

FrankEtier · 01-03-2022, 09:28 PM

Quote:

Originally Posted by spoolin03

It drones even with the supercharger?

Yes.

12-30-2021, 05:03 PM	#16 (permalink)
Spartan 1771 A True Z Fanatic Join Date: Nov 2009 Location: Western Maryland Posts: 1,279 Drives: Wife crazy & 09 370Z Rep Power: 105454	and as far as FI vs stock CBE is concerned, I don't think their design is very similar at all. The stock system is a Y-pipe, has a lot more bends and weighs considerably more. redondoaveb, Mr.K and spoolin03 like this. __________________ ~Rob -DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...

12-30-2021, 05:10 PM	#17 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,423 Drives: 2011 Nismo GM 6M Rep Power: 2684438	I have the FI lth's with the 12" resonators. There is some drone around 2500 rpm. The 18" resonators take most of it alway. The FI CBE is a true dual exhaust. Spartan 1771, redondoaveb and spoolin03 like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

01-01-2022, 11:00 AM	#23 (permalink)
Rjk370z Base Member Join Date: Dec 2021 Location: Sacramento Posts: 120 Drives: 370z touring sport Rep Power: 10819	I had a similar issue when I got my car. It had a resonated catless downpipe. Man, it was loud and I could not take it. Put the stock cats back on, much more manageable. Can you try putting the stock cats back on and giving it a try? 370z_stillen likes this. __________________

01-01-2022, 04:26 PM	#25 (permalink)
FrankEtier Base Member Join Date: Jul 2019 Location: McKinney, TX Age: 49 Posts: 145 Drives: 2014 370Z SC Rep Power: 11605	I have the Greddy Evolution GT dual exhaust with motordyne Art pipes. Sounds great but is fairly loud and does drone at 3K rpm in my car. spoolin03 likes this. __________________ ‘14 Topgunz Speedworks Rotrex Supercharged VR30 7AT 370Z Magma Red. @liquid.magma

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