Know it's been asked a million times, but couldn't find it when I searched. Can someone tell me the exact difference between the exhaust system on the SS vs. a regular Z-28? I know the SS is supposed to be less restrictive and worth around 10 more HP, but what are the specs that make it flow better?

Thanks,
Dave

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Dave "Vegatex" English
<'02 Sebring Silver/Ebony Leather Z-28 A4; T-tops, 3.23 gears, ASR.
Mods: Spectacle SFC's/STB, FIPK, de-screened MAF, red calipers, leather shift boot.
96 LT1-powered '76 Vega Wagon, Howell Engine Developments Computer and Harness, Sanderson CC-13HO headers, Be Cool aluminum rad w/dual 11" SPALS, custom cold air induction, 700r4, Modified 7.5" 10 bolt w/Torsen rear diff, 28-spline Moser Custom Alloy axles, 3.42 rear, '98 Camaro rear disks, cross-drilled and slotted S-10 front disks. 2800 pounds of fuel-injected Whoop-***!>
http://h-body.org/people/projects/building_lt1/index.html

 

The base SS exhaust just has a freer flowing muffler, and different tips. Whereas the optionl Dual/Dual, is a completely new exhaust. It has a 3" intermediate pipe, the free flowing muffler, and bigger tailpipes.

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Brian Patterson 00' Onyx Black SS M6

Mods: free mods, Direct-Flo w/K+N, cutout, Pro 5.0, Harlan Shift Light, Ram 6130/402 Combo, Mcleod Adj. MC w/drill mod, newly rebuilt T-56 w/updated slave, and some shiny, reflective stickers!

Best Time: 12.6 @112 on a 2.00 60'


Member of MTFBA (Middle Tennessee F-Body Association)

 

Yep, Unbelievable's got it right. The optional SLP stainless exhaust, is available in dual/duals, or as 2 rectangular shaped tips, in the center of an add on, they put on the rear bumper. The center mount is only a cosmetic mod. They both give a 10 hp boost, over the staock SS exhaust.

Check with others on here. Some are running other aftermarket exhausts, they like beter. I got the SLP version, just because it could be ordered that way and may add value,,,,way down the road. Who knows, just my choice.

Good luck
Mark

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2002 SS, Coupe, M6, with Hurst Shifter, SLP Dual/Dual Exhaust, Bilstein Suspension, SLP Ram Air Box, Granatelli tuned MAF, Holley Powershot, Nitto Drag Radials, Rally Red, T-Tops, Black Leather, SLP SS Grill & 5 Spoke Chrome SS Wheels

 

Are the pipes larger diameter on an SS vs. a Z-28, or is it just a less restrictive muffler on the SS?

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Dave "Vegatex" English
<'02 Sebring Silver/Ebony Leather Z-28 A4; T-tops, 3.23 gears, ASR.
Mods: Spectacle SFC's/STB, FIPK, de-screened MAF, red calipers, leather shift boot.
96 LT1-powered '76 Vega Wagon, Howell Engine Developments Computer and Harness, Sanderson CC-13HO headers, Be Cool aluminum rad w/dual 11" SPALS, custom cold air induction, 700r4, Modified 7.5" 10 bolt w/Torsen rear diff, 28-spline Moser Custom Alloy axles, 3.42 rear, '98 Camaro rear disks, cross-drilled and slotted S-10 front disks. 2800 pounds of fuel-injected Whoop-***!>
http://h-body.org/people/projects/building_lt1/index.html

 

From what I have seen, the Z28 is 2.5" pipe, the SS is 2.75", and most aftermarket are 3" to 4"

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2002 Camaro Z/28 LS1 A4 (2.73's)
Sunset Orange Metallic
Fernco, SLP Airlid, K&N Filter
-----------------------
1995 Ford Aspire M5
!Torque & !Power

 

The standard SS is 2.75", whereas the optional exhaust for the SS is 3".

 

The stock Z28 pipe is 2.75 inches not 2.5.

------------------
2001 Z28 Camaro w/A4
Navy blue, chrome wheels, t-tops, leather seats, CD changer, 3.23 performance rear end, etc…
Mods: Suncoast SS Hood, Ram Air Box, K & N Filter, Flowmaster Exhaust, SLP Y-Pipe, Hypertech Programmer and Nitto Drag Radials.
Best Timew/Whisper lid & Flowmaster Exhaust Only)
1/4 mile – 13.26
MPH – 104.64
60 ft – 1.975

 

OK, here we go again. Who's right? Is it 2.5 or 2.75 on the Z-28?



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Dave "Vegatex" English
<'02 Sebring Silver/Ebony Leather Z-28 A4; T-tops, 3.23 gears, ASR.
Mods: Spectacle SFC's/STB, FIPK, de-screened MAF, red calipers, leather shift boot.
96 LT1-powered '76 Vega Wagon, Howell Engine Developments Computer and Harness, Sanderson CC-13HO headers, Be Cool aluminum rad w/dual 11" SPALS, custom cold air induction, 700r4, Modified 7.5" 10 bolt w/Torsen rear diff, 28-spline Moser Custom Alloy axles, 3.42 rear, '98 Camaro rear disks, cross-drilled and slotted S-10 front disks. 2800 pounds of fuel-injected Whoop-***!>
http://h-body.org/people/projects/building_lt1/index.html

 

I fairly certain the the Z is 2.5" and the SS is 2.75". I swapped my stocker for an SS with a cut out.

------------------
'99 Z28 M6
Mods: Click here!
Best Time: 13.3691 @ 106mph (no N2O)
60ft: 2.12
AOL IM: Bubblesnaps

 

I have heard on many occasions that stock Z is 2.5" I'm just too lazy to go measure, LOL


------------------
2002 Camaro Z/28 LS1 A4 (2.73's)
Sunset Orange Metallic
Fernco, SLP Airlid, K&N Filter
-----------------------
1995 Ford Aspire M5
!Torque & !Power

 

I just so happened to have my stock Z28 exhaust sitting in my garage on the floor right now, so I figured I would chime in... it's definately a 2.75 inch i-pipe. Just took a ruler out there and measured the diameter. Hope this helps. :-D

------------------
2002 Camaro Z28
Appearance: White, 5% tint, Black RS style racing stripes, RKSport rear Fascia lettering, SLP bowtie grille, diamond clear corners, gloss black calipers with chrome 'CAMARO' lettering, soon to have 18" Z06 rims

Performance: K&N FIPK, 3 inch custom exhaust by Thorley Headers/Jardine Performance, cutout, skip shift eliminator, FRA, DMS subframe connectors, Eibach pro-kit in the mail, more to come.

Stereo: Boston Pro-Series components, JL Audio 6.5 inch subs in sail panels, Kenwood KDC-X815 head unit, two Alpine V12 amps, Image Dynamics IDQ10 sub in JL Audio Stealthbox, Phatnoise MP3 player (AKA Kenwood music keg)

2001 Camaro RS
White w/ black stripes, all SLP options

1991 Camaro RS
Light blue, 305 V8, tinted windows, stereo system, lowered, KYB struts and shocks, chrome stock rims, Flowmaster exhaust with 3.5 inch tips

 

That definately makes sense considering the SS exhaust was an exact fit to my Z28 Y. I must have been thinking about the muffler outlet pipes.

------------------
'99 Z28 M6
Mods: Click here!
Best Time: 13.3691 @ 106mph (no N2O)
60ft: 2.12
AOL IM: Bubblesnaps

 

Thanks, JD. I was getting ready to take a tape measure and do the calculations.

Dave



------------------
Dave "Vegatex" English
<'02 Sebring Silver/Ebony Leather Z-28 A4; T-tops, 3.23 gears, ASR.
Mods: Spectacle SFC's/STB, FIPK, de-screened MAF, red calipers, leather shift boot.
96 LT1-powered '76 Vega Wagon, Howell Engine Developments Computer and Harness, Sanderson CC-13HO headers, Be Cool aluminum rad w/dual 11" SPALS, custom cold air induction, 700r4, Modified 7.5" 10 bolt w/Torsen rear diff, 28-spline Moser Custom Alloy axles, 3.42 rear, '98 Camaro rear disks, cross-drilled and slotted S-10 front disks. 2800 pounds of fuel-injected Whoop-***!>
http://h-body.org/people/projects/building_lt1/index.html

 

So I did anyway! Here's what I measured on a stock '02 Z-28: (Outer diameters only, slightlyless for I.D.)

From y-pipe to muffler-- 8.8 inches o.d. divided by pi = 2.8 inches diameter.

From muffler to tips-- 7.0 inches o.d. divided by pi = 2.2 inches diameter.

So it seems the stock Z-28 exhaust is 2.75" from the y-pipe to muffler, and from muffler to tips 2" diameter. SS is probably 2.75 and 2.5 respectively with a freere-flowing muffler.

Thanks to all who contributed,
Dave


------------------
Dave "Vegatex" English
<'02 Sebring Silver/Ebony Leather Z-28 A4; T-tops, 3.23 gears, ASR.
Mods: Spectacle SFC's/STB, FIPK, de-screened MAF, red calipers, leather shift boot.
96 LT1-powered '76 Vega Wagon, Howell Engine Developments Computer and Harness, Sanderson CC-13HO headers, Be Cool aluminum rad w/dual 11" SPALS, custom cold air induction, 700r4, Modified 7.5" 10 bolt w/Torsen rear diff, 28-spline Moser Custom Alloy axles, 3.42 rear, '98 Camaro rear disks, cross-drilled and slotted S-10 front disks. 2800 pounds of fuel-injected Whoop-***!>
http://h-body.org/people/projects/building_lt1/index.html