HFC Diameter vs volume question - - Infiniti G35 & G37 Forum Discussion | setemail.ru
Show Your Support Become A Premier Member

    > > >
  • Reload this Page >
    • HFC Diameter vs volume question


HFC Diameter vs volume question

Thread Tools Rate Thread
Old 01-17-2018, 09:04 PM
Registered User
Thread Starter
Join Date: Apr 2017
location: Moscow, ID
Posts: 30
Thanks: 0
Thanked 4 Times in 4 Posts
HFC Diameter vs volume question

It may have been answered already, but I couldn't find any information anywhere. I currently have 2.5" FI RHFC into a full Tanabe CBE on my coupe, but realized just how loud it is from outside the car whenever I touch the fun pedal (not straight-piped Mustang loud, but enough to turn heads, which isn't quite what I want. It's also deep at low RPM, almost too deep for me; I like a slightly more restrained sound). I've done some reading and see that the Kinetix HFC (just taking an example, I don't know much about Kinetix) is a 2.25" HFC. That would fit my system better, as right now I'm going 2.5" from the HFC to 2.36" on the Y-pipe which expands to 2.75 midway down the Y-pipe all the way to the tips.

Would going from the 2.5" FI RHFC down to the 2.25" Kinetix HFC have a volume impact? I would probably gain a little bit of rasp due to losing the resonator, but I feel like the decrease in diameter would offset it/reduce the volume. Am I correct in this assumption, or totally wrong?
Old 01-20-2018, 03:20 AM
Premier Member
Join Date: Jun 2016
Posts: 561
Thanked 29 Times in 27 Posts
High flow cats won't muffle the sound as well as stock. Adding another resonator to your exhaust might help and be a lot less expensive.
Old 01-20-2018, 04:25 AM
Registered User
Thread Starter
Join Date: Apr 2017
location: Moscow, ID
Posts: 30
Thanks: 0
Thanked 4 Times in 4 Posts
Quote:
Originally Posted by Scottwax View Post
High flow cats won't muffle the sound as well as stock. Adding another resonator to your exhaust might help and be a lot less expensive.
I'm just wondering if a 2.25" HFC would be quieter at all than a 2.5" HFC, or if the volume change wouldn't be noticeable. If it doesn't make a difference, I was planning on adding a resonator/replacing the small Tanabe one.
Old 01-20-2018, 08:35 AM
's Avatar
Cleric670
Join Date: May 2017
location: Washington State
Posts: 2,359
Thanked 233 Times in 225 Posts
Decibel level isn't determined by diameter so no, frequency however, WILL change.
Old 01-20-2018, 10:20 PM
Premier Member
Join Date: Jun 2016
Posts: 561
Thanked 29 Times in 27 Posts
Oh, you also have the Tanabe...not particularly loud but the drone on part throttle acceleration and at 2500 rpm was pretty bad. Swapped the muffer itself for a Dynomax Super Turbo, helped a lot. But probably going to end up getting the Vibrant ultra quiet resonator to get rid of what's left.
Old 01-20-2018, 11:40 PM
Registered User
Thread Starter
Join Date: Apr 2017
location: Moscow, ID
Posts: 30
Thanks: 0
Thanked 4 Times in 4 Posts
Quote:
Originally Posted by [email protected] View Post
Decibel level isn't determined by diameter so no, frequency however, WILL change.
Got it; the hassle to trade my FI RHFC for someone's 2.25" HFC's in good condition wouldn't be worth it then, considering the tiny impact it will most likely have. Guess I'll look into swapping/welding in a resonator like Scottwax said, or maybe a small box-muffler if I really feel like toning it down. Thanks guys!
The Following User Says Thank You to Magneu For This Useful Post:
Scottwax (01-26-2018)

Related Topics
Thread Thread Starter Forum Replies Last Post
FI HFC, Berk HFC, or Stillen HFC? ramo V36 Engine, Exhaust, Drivetrain & FI 19 11-11-2008 10:11 PM
overall diameter question... acidrane Wheels & Tires 4 07-09-2008 02:20 AM
can this be right? sub box volume question OhNelly Audio, Video & Electronics 0 07-27-2005 05:36 AM
Stock Air Intake Tube Inner Diameter vs. Z Tube Inner Diameter G35UKY G35 Coupe V35 2003 - 07 3 05-27-2005 11:46 AM
question about MAF housing diameter cjones1344 G35 Sedan V35 2003-06 5 03-07-2005 07:19 AM

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:49 PM.

setemail.ru - Archive - - - - - Top

Copyright ©2002 - 2017, setemail.ru All Rights Reserved. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in:

Related pages


5x120 bolt patternv2 vortech superchargerpermaplate paintguard renewerforgestar f15350z reliability350z daytime running lightsp0300 fault codehow to install dynamat in trunkyounker nissanwheel spacer studsinfinity tires canadahow to bleed your cooling systemdot racing harnessnexen n5000 tires reviewhow to program viper alarm remotebazooka bass tube installationg35 pop chargerthrottle body heaterredline transmission fluidjl audio w7 boxhow to drive manual transmission smoothlyvapor canister purge solenoid locationgriffin tuneflex auxwalmart headlights automotive2007 nissan maxima oil cooler o ringmaxima forums 7th genled h1 bulbnitrous remote bottle openerinvisiguard clear braplasti dip with glossg35xs specswhen i stop my car shakesbody shops mississaugainfiniti g37s blackmazda rx7 r1brembo rear brakesaem wideband wiring diagramrear coiloveravante garde rimscost to replace windshielddupli color hyper silveraxis super hirowindow tinting in virginia beachnokya cosmic whiteblack out tail lights legal75w140how to reset airbag lightboze rimsroyal purple vs lucas oilalpine mrp1000mvr rimspioneer 6x8brake slip vdc off lights on10000k hid illegalvq37vhr turbopac roem-nis2titanium exhaust tiplightest drag racing wheelsron jon acurafastest nissan maximarhd front clipsvt contour turbo kitgravity bleedfront hub bearing noiseknock sensor costinjen decalt1 subwooferhow to replace light bulb in makeup mirroramplifier clipping causes2006 infiniti g35 recallsnsx lambo doorsdiy intake heat shield