Sound Modification Tips

lfrz93 · 04-30-2015, 10:45 AM

Hi all!

So, I'm currently running an AP Catback with some Top Speed Pro test pipes. I love the set up, but there is only one problem;

ITS REALLY FREAKING LOUD

I wouldn't have a problem with this if cold starts weren't a thing, but going into the car in the morning, waking up half the neighborhood and making my ears bleed that early isn't what I envisioned. I really like the sound of the exhaust, though it is a bit droney (it sounds so great on heavy throttle).

What do you recommend? Some resonated TPs? HFCs?

Thanks!

jaytirbhaw · 04-30-2015, 10:47 AM

HFCs will quiet it down some

lfrz93 · 04-30-2015, 10:50 AM

Quote:

Originally Posted by jaytirbhaw

HFCs will quiet it down some

Will it be only slightly quieter or significantly? Should I just keep the TPs and put the stock exhaust back on?

Thanks!

BC416 · 04-30-2015, 10:50 AM

Some HFC's will quiet it down.

I've come to the conclusion that the car sounds best with just a good quality cat-back. The sound is more important to me than some extra HP so I'm simply sticking with my F.I cat back for now.

lfrz93 · 04-30-2015, 10:53 AM

Quote:

Originally Posted by BC416

Some HFC's will quiet it down.

I've come to the conclusion that the car sounds best with just a good quality cat-back. The sound is more important to me than some extra HP so I'm simply sticking with my F.I cat back for now.

Hmmm, I've considered just throwing the cats back on. My friend Danny has his 7AT with just some AAM Short tails and it sounds great (not nearly as loud as mine). I'm guessing my Z would sound well with just the AP catback

BC416 · 04-30-2015, 10:57 AM

Quote:

Originally Posted by lfrz93

Hmmm, I've considered just throwing the cats back on. My friend Danny has his 7AT with just some AAM Short tails and it sounds great (not nearly as loud as mine). I'm guessing my Z would sound well with just the AP catback

You can throw the stock cats back on or the stock cat-back on, either way will def quiet it down and you won't have to spend any money. My last car was loud as hell and the one thing I wanted to make sure with the Z was that it was aggressive sounding but not obnoxious.

lfrz93 · 04-30-2015, 10:59 AM

Quote:

Originally Posted by BC416

You can throw the stock cats back on or the stock cat-back on, either way will def quiet it down and you won't have to spend any money. My last car was loud as hell and the one thing I wanted to make sure with the Z was that is was aggressive sounding but not obnoxious.

I agree. Though I enjoy the loudness, it is obnoxious as hell at times. Merging on to the highway i can't talk to the person next to me and the drone between 2.4k-3.1k is really annoying.

Do you think the stock cats or stock exhaust will quiet it down the most? I'm inclined to putting the cats back on rather than the stock exhaust

BC416 · 04-30-2015, 11:04 AM

Quote:

Originally Posted by lfrz93

I agree. Though I enjoy the loudness, it is obnoxious as hell at times. Merging on to the highway i can't talk to the person next to me and the drone between 2.4k-3.1k is really annoying.

Do you think the stock cats or stock exhaust will quiet it down the most? I'm inclined to putting the cats back on rather than the stock exhaust

I can't really comment on how it would sound with the stock exhaust and aftermarket cats as my cats have always been stock. I can tell you with just my cat-back exhaust installed the car sounds like absolute sex.

Since you're in FL you don't have to worry about emissions - so you don't have to take that into account.

Your best bet would be to throw on the stock cats and fire her up, see how it is. I'm also not a fan of the hiss that aftermarket cats make so that's another reason to keep em stock.

lfrz93 · 04-30-2015, 11:07 AM

Quote:

Originally Posted by BC416

I can't really comment on how it would sound with the stock exhaust and aftermarket cats as my cats have always been stock. I can tell you with just my cat-back exhaust installed the car sounds like absolute sex.

Since you're in FL you don't have to worry about emissions - so you don't have to take that into account.

Your best bet would be to throw on the stock cats and fire her up, see how it is. I'm also not a fan of the hiss that aftermarket cats make so that's another reason to keep em stock.

alright! Sounds like I have a plan now haha. Sucks that I'd have one less mod but at least my car will sound better.

Thanks for the help!

BC416 · 04-30-2015, 11:15 AM

Quote:

Originally Posted by lfrz93

alright! Sounds like I have a plan now haha. Sucks that I'd have one less mod but at least my car will sound better.

Thanks for the help!

No problem man - the good thing is you can always try some different combinations of stock/aftermarket since you already own them. I hear ya on the less mods - however I've come to learn that just because something is modded, doesn't make it better.

Enjoy the car!

Chuck33079 · 04-30-2015, 11:21 AM

Why not try a quieter cat back?

SurfDog · 05-04-2015, 02:32 PM

I put dynamat along my exhaust corridor (mostly in the hatch). It helped. Test pipes on my Berk CBE makes an ugly resonant rattle through certain parts of the rpm range. I don't really recommend the Berk CBE for that reason. (I've got full breather mods with CAt delete so your experience might vary with Berk)

Agent K · 05-04-2015, 04:27 PM

I made the mistake of swapping my 12" resonated FI x-pipe for a non-resonated x-pipe. The sound was louder but the drone was unbearable. My wife and I couldn't communicate while I was driving. Plus the drone was causing me headaches. So I had a shop weld some resonators on my x-pipe; problem solved. I went with 10" resonators this time. A little bit louder than the original and the sound is fantastic.

04-30-2015, 10:45 AM	#1 (permalink)
lfrz93 Base Member Join Date: Aug 2014 Location: Miami, FL Age: 31 Posts: 154 Drives: '09 6MT 370z To/Sprt Rep Power: 11	Sound Modification Tips Hi all! So, I'm currently running an AP Catback with some Top Speed Pro test pipes. I love the set up, but there is only one problem; ITS REALLY FREAKING LOUD I wouldn't have a problem with this if cold starts weren't a thing, but going into the car in the morning, waking up half the neighborhood and making my ears bleed that early isn't what I envisioned. I really like the sound of the exhaust, though it is a bit droney (it sounds so great on heavy throttle). What do you recommend? Some resonated TPs? HFCs? Thanks! __________________ Instagram: LFRZ93 / Tommy Kaira Knob / Agency Power Catback / Top Speed Test Pipes

04-30-2015, 10:47 AM	#2 (permalink)
jaytirbhaw Track Member Join Date: Dec 2009 Location: NYC Posts: 814 Drives: 350z HR , Nismo 370z Rep Power: 17	HFCs will quiet it down some __________________ 2014 Nismo #350 , Built Motor, Top Mount Single Turbo .... 620 whp/ 500 lbs wtq 2012 Track/Drift Z, build coming soon. Build Thread - http://www.the370z.com/members-370z-...70z-build.html

04-30-2015, 10:50 AM	#4 (permalink)
BC416 Track Member Join Date: Jun 2014 Location: NJ Age: 37 Posts: 718 Drives: 2012 KAD 6MT Rep Power: 592	Some HFC's will quiet it down. I've come to the conclusion that the car sounds best with just a good quality cat-back. The sound is more important to me than some extra HP so I'm simply sticking with my F.I cat back for now. Streetlife and lfrz93 like this. __________________ F.I. / K&N / 180 / Forgestar

04-30-2015, 11:21 AM	#11 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Why not try a quieter cat back? __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

05-04-2015, 02:32 PM	#12 (permalink)
SurfDog A True Z Fanatic Join Date: May 2012 Location: Colorado (9000 feet) Age: 56 Posts: 1,796 Drives: 09 6mt, 13 Sequoia, Rep Power: 15749	Sound Modification Tips I put dynamat along my exhaust corridor (mostly in the hatch). It helped. Test pipes on my Berk CBE makes an ugly resonant rattle through certain parts of the rpm range. I don't really recommend the Berk CBE for that reason. (I've got full breather mods with CAt delete so your experience might vary with Berk) lfrz93 likes this. __________________ 09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix

05-04-2015, 04:27 PM	#13 (permalink)
Agent K Base Member Join Date: Jul 2013 Location: Memphis, TN Posts: 155 Drives: '13 370Z MBlue 6MT Rep Power: 12	I made the mistake of swapping my 12" resonated FI x-pipe for a non-resonated x-pipe. The sound was louder but the drone was unbearable. My wife and I couldn't communicate while I was driving. Plus the drone was causing me headaches. So I had a shop weld some resonators on my x-pipe; problem solved. I went with 10" resonators this time. A little bit louder than the original and the sound is fantastic. Memphis370Z likes this. __________________ '13 370Z Midnight Blue 6MT / Touring Sport w/nav / PPE Long Tube Racing Headers / FI TDX 10" Resonator w/CF mufflers / K&N Drop-Ins / ZSpeed Underbody Shroud v2 / DRL 'always on' Mod

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