Forced Induction with Cutouts - Any Issues? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

BiggFoot · 10-15-2013, 05:28 PM

I am considering adding cutouts on my exhaust just for occasional fun, but want to know if anyone running boost and cutouts have had any issues.

I know of one other guy on the forum that I have corresponded with that said he gets a "backfire" when deceleration occurs (he has cutouts) but did not have this issue when he was just running a cam and headers. The backfire started after adding forced induction.

I asked him if he had to do it all over again if he would still add them and he basically said it was great before adding boost, but now it was bad enough that he intends to change up his exhaust system.

I am running a Maggie set at 10 psi and full Kooks headers/cats/mufflers, etc. My shop will install a set of cutouts for ~ $800.

I would like to hear what you guys have to say first.

Thanks!

Biggfoot

mikepage0007 · 10-15-2013, 05:57 PM

from what i heard, there were heat issues due to the boost and exhaust runs hotter...most people complained that motors went bad due to heat, anything running approx 600rwhp, i would prob not advise it..imo

jrpxxii · 10-15-2013, 06:00 PM

No issues at all. Just dumping exhaust earlier

BrainleSS · 10-15-2013, 06:15 PM

I had no issues when I was running my Whipple & DMH combo, love that sound!

rdblan2 · 10-15-2013, 06:20 PM

I have QTPs with the whipple. It's loud as shit when you open them, like Earth shaking, life changing loud. I don't run them open often though.

TinyToasta · 10-16-2013, 01:18 AM

No issues whatsoever!
Noweeds (FI) since 2011, currently @ 15# boost - all is well!

Boost seems to drop a bit, but it's difficult to read the gauge when going flat-out with diverters open

BiggFoot · 10-16-2013, 04:30 PM

I appreciate the replies.

casper sc/1ss/rs · 10-16-2013, 04:43 PM

They sound great open, but at the track my car slows down over a second, it feels like it loses boost and runs like crap.

DarkCry956 · 10-16-2013, 05:19 PM

I have a centri and it seems less responsive and shifts tend to lag on part throttle. I just don't like the feel of them open. I haven't gone WOT with them open after the blower. Also I was told by my tuner that I dropped 8 HP on the dyno w them open

DarkCry956 · 10-16-2013, 05:20 PM

Oh I forgot to say I love cruising with them open they're awesome

rdblan2 · 10-16-2013, 06:14 PM

I should also mention my car is noticeably sluggier from a stop with them open. This may be a good thing if you don't have traction on street tires.

Nitroman28 · 10-16-2013, 07:51 PM

Quote:

Originally Posted by rdblan2

I should also mention my car is noticeably sluggier from a stop with them open. This may be a good thing if you don't have traction on street tires.

I cut the same 60 and same ET open or closed. Dyno #'s don't change open or closed.

rdblan2 · 10-16-2013, 09:22 PM

The numbers may not change, I just notice the car is slower out of the hole with them open.

2L82RUN · 10-16-2013, 10:04 PM

Whipple with DMH cutouts. No cats. Dyno #'s don't change much open or closed. +\- 3hp.
Have a friend with same setup running hi flow cats and he ran into heat issues when running with them open. Melted some shit. I haven't had that issue but not running cats either.

10-15-2013, 05:28 PM	#1
BiggFoot Drives: 2010 Camaro (M6) 1000+ HP SBE Join Date: Jun 2011 Location: Houston Posts: 1,391	Forced Induction with Cutouts - Any Issues? I am considering adding cutouts on my exhaust just for occasional fun, but want to know if anyone running boost and cutouts have had any issues. I know of one other guy on the forum that I have corresponded with that said he gets a "backfire" when deceleration occurs (he has cutouts) but did not have this issue when he was just running a cam and headers. The backfire started after adding forced induction. I asked him if he had to do it all over again if he would still add them and he basically said it was great before adding boost, but now it was bad enough that he intends to change up his exhaust system. I am running a Maggie set at 10 psi and full Kooks headers/cats/mufflers, etc. My shop will install a set of cutouts for ~ $800. I would like to hear what you guys have to say first. Thanks! Biggfoot __________________ F-1X, Cog Drive, ATI Super Pulley/Sprag ~ 19 psi Blower Cam Brodix BP BR 3 Heads Kooks LT Headers and full 3" exhaust Fore Triple Pump Fuel System with ID 1700X Injectors - E85 conversion DSS 9” Conversion (1400 hp axles, driveshaft, pumpkin) & Strange 3.70 gears McLeod RXT Twin HD Clutch & Upgraded Slave RPM Level VII TR6060 BMR Drag Suspension Package w/Strange shocks Carlyle 15" and M/T ET Street R radials 10.1 @ 143 mph 1/4 mile

10-15-2013, 05:57 PM	#2
mikepage0007 Drives: 2010 camaro Join Date: Aug 2009 Location: port st lucie ,florida Posts: 4,273	from what i heard, there were heat issues due to the boost and exhaust runs hotter...most people complained that motors went bad due to heat, anything running approx 600rwhp, i would prob not advise it..imo __________________

10-15-2013, 06:00 PM	#3
jrpxxii Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009 Location: Bowling Green, Ky Posts: 3,355	No issues at all. Just dumping exhaust earlier __________________

10-15-2013, 06:20 PM	#5
rdblan2 Drives: 2SS RS Join Date: Mar 2010 Location: MD Posts: 1,272	I have QTPs with the whipple. It's loud as shit when you open them, like Earth shaking, life changing loud. I don't run them open often though. __________________ Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).

10-16-2013, 01:18 AM	#6
TinyToasta Drives: way too fast.... Join Date: May 2010 Location: Germany Posts: 297 View My Garage	No issues whatsoever! Noweeds (FI) since 2011, currently @ 15# boost - all is well! Boost seems to drop a bit, but it's difficult to read the gauge when going flat-out with diverters open __________________ custom build forged LSA, 379ci, TVS2300@15psi, 696rwhp/688ft-lbs, built by DH Individual, Customkingz, tuned by Jannetty Racing JRE rough idle cam, JRE ported lower intake manifold, OD cog drive, 6% OD crank pulley, ported ls3 heads, NW102mm TB, 1/2'' RDS spacer, IW 8-rib drive Pfadt Cradle Bushings, Arms & Rods, Pedders Supercar w/FE4 conversion, ZL1 sways, HE Twin Carbon Street Slayer, ZL1 Rear End (3.73) CTS-V Brake upgrade, Street: 22'' Vossen CV1, Strip: 18'' Forgestar F14 on MT Street Radials

10-15-2013, 06:15 PM	#4
BrainleSS Working on my 2nd one! Drives: Camaro Join Date: Feb 2010 Location: Southern Indiana Posts: 552 View My Garage	I had no issues when I was running my Whipple & DMH combo, love that sound!

10-16-2013, 04:30 PM	#7
BiggFoot Drives: 2010 Camaro (M6) 1000+ HP SBE Join Date: Jun 2011 Location: Houston Posts: 1,391	I appreciate the replies. __________________ F-1X, Cog Drive, ATI Super Pulley/Sprag ~ 19 psi Blower Cam Brodix BP BR 3 Heads Kooks LT Headers and full 3" exhaust Fore Triple Pump Fuel System with ID 1700X Injectors - E85 conversion DSS 9” Conversion (1400 hp axles, driveshaft, pumpkin) & Strange 3.70 gears McLeod RXT Twin HD Clutch & Upgraded Slave RPM Level VII TR6060 BMR Drag Suspension Package w/Strange shocks Carlyle 15" and M/T ET Street R radials 10.1 @ 143 mph 1/4 mile

10-16-2013, 04:43 PM	#8
casper sc/1ss/rs Drives: 2011 camaro ss vortech supercharged Join Date: Aug 2011 Location: marion VA. Posts: 524 View My Garage	They sound great open, but at the track my car slows down over a second, it feels like it loses boost and runs like crap.

10-16-2013, 05:19 PM	#9
DarkCry956 Drives: 2011 Camaro 2SS/RS Join Date: Oct 2011 Location: Texas RGV Posts: 794	I have a centri and it seems less responsive and shifts tend to lag on part throttle. I just don't like the feel of them open. I haven't gone WOT with them open after the blower. Also I was told by my tuner that I dropped 8 HP on the dyno w them open

10-16-2013, 05:20 PM	#10
DarkCry956 Drives: 2011 Camaro 2SS/RS Join Date: Oct 2011 Location: Texas RGV Posts: 794	Oh I forgot to say I love cruising with them open they're awesome

10-16-2013, 06:14 PM	#11
rdblan2 Drives: 2SS RS Join Date: Mar 2010 Location: MD Posts: 1,272	I should also mention my car is noticeably sluggier from a stop with them open. This may be a good thing if you don't have traction on street tires. __________________ Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).

10-16-2013, 09:22 PM	#13
rdblan2 Drives: 2SS RS Join Date: Mar 2010 Location: MD Posts: 1,272	The numbers may not change, I just notice the car is slower out of the hole with them open. __________________ Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).

10-16-2013, 10:04 PM	#14
2L82RUN Drives: ABM SS/RS Join Date: Sep 2009 Location: WV Posts: 587	Whipple with DMH cutouts. No cats. Dyno #'s don't change much open or closed. +\- 3hp. Have a friend with same setup running hi flow cats and he ran into heat issues when running with them open. Melted some shit. I haven't had that issue but not running cats either.