Berk hfc+magnaflow cat back rasp???

franky2222

i already had BERK HFC and had rasp NOW just put on a new magnaflow exhaust ANDS the rasp IS WORSE than with STOCK catback


do ALL HFC AND TP RASP whats going on

__________________
08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

NewlyIMPORTed

My rasp went away when I went aftermarket for the exhaust. It depends on the exhaust I guess but Hfc's have very little rasp on most aftermarket exhausts. test pipes, on the other hand, always have rasp.

__________________
2011 WRX STICobb Accessport, Nameless Performance exhaust, COBB SF Intake, COBB downpipe, 20% tint, Work Emotion XD9's

daisuke149

check for exhaust leaks

havnt seen or heard a magna flow yet to really be able to say thats the culprit.

franky2222

the rasp is coming from the BERK CATS only under hard throttle.are the cats devective maybe or is it normal with BERK HFC???

__________________
08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

christian370z

It is not just the HFCs. It has more to do with the cat-back as I have the 12" resonated FI exhaust behind my Berk HFCs and I have zero rasp. Other exhausts like the Invidia, Amuse, Greddy, and other exhausts also have no rasp with HFCs or test pipes either.

__________________
-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

franky2222

^^^so the plot thickens???do you have a Hiss at 1500-2000RPM,,,,maybe my mechanic overlooked something,,,the RASP is absolutely rediculous its ALL YOU HEAR at wot

__________________
08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

christian370z

It has a lot to do with the cat-back. There are a number of factors but the most important ones that affect sound are whether the exhaust has an x pipe or H pipe, resonators (size, shape and internal design), and the mufflers (size, shape, and internal design). After looking at some videos on youtube, the Magnaflow exhaust has a bit of rasp even with the stock cats and that rasp would only be amplified with HFCs or test pipes. Here is my FI exhaust with HFCs for reference, go to around 1:00 and the 3:00 minute marks for WOT runs:

__________________
-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

franky2222

removed the BERK CATS (FOR SALE BTW PM ME) and now there is no rasp and sounds amazing SO THE QUESTION IS WHAT CATS ARE people running on here with the magnaflow CATback??????? thanks for all the help i get here

__________________
08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

ERZperformance

Put a resonator somewhere in the mid pipe this will help because Magnaflow is known never to use a resonator.

__________________
http://www.cntracing.com
http://www.ERZperformance.com
800-363-8599

franky2222

^^^^thanks for the suggestion what about header wrap???

__________________
08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

B.A.Q

Berks are great if you asked me

__________________

SOLD!! 09 370z Touring MT: GReddy Ti-C CBE - Berk HFC - Stillen 3G CAI
'11 Mustang GT/CS 5.0 MT

quicksilver08

Berks and magnaflows here with no rasp. My catback came with resonators though.

__________________
2008 Infiniti G37s 6mt coupe
Berk HFC, Magnaflow Catback, JWT Popchargers, H&R, Eibach, Stillen Sways, B&M short throw, 4.08 frontier gears, NST pulleys